Investigate in MTG: Rules, History, and Best Cards

Last updated on December 22, 2025

Thraben Inspector | Illustration by Matt Stewart

Investigate is one of my favorite mechanics. Instead of drawing a card right away, you create a Clue token you can crack later for value—or even use in other clever ways.

But did you know not every card that creates a Clue actually investigates? Why is that? Don’t worry, today we’re going to answer that question and many more surrounding this intriguing mechanic.

Let the investigation begin!

How Does Investigate Work in Magic: The Gathering?

Sharp-Eyed Rookie | Illustration by Jake Murray

Investigate is a keyword action that creates a Clue token. Whenever a card says “investigate”, you create a colorless artifact token with the ability “, Sacrifice this: Draw a card.” That means you can spend 2 mana later, sacrifice the Clue, and draw a card when you need it.

Investigating doesn’t draw a card right away—it gives you a flexible resource that can turn into card advantage whenever the time is right.

The History of Investigate in MTG

Investigate debuted in 2016 with Shadows over Innistrad, a set full of spooky mysteries and detective vibes. Cards like Thraben Inspector, Expose Evil, and Tireless Tracker helped introduce Clue tokens and made players feel like they were uncovering secrets on the battlefield. The mechanic disappeared right after in Eldritch Moon because the story shifted toward cosmic horror — once Emrakul showed up, there weren’t any mysteries left to solve.

After that, investigate became what Wizards calls a deciduous mechanic. That means it isn’t used all the time, but they can bring it back whenever a set needs a mystery element. We saw it return in Innistrad: Midnight Hunt with cards like Secrets of the Key and the MID Commander card Eloise, Nephalia Sleuth. These weren’t huge waves of investigate cards, but they kept the mechanic alive.

Investigate also pops up in special products and Commander decks. For example, Modern Horizons 2 added strong support pieces like Lonis, Cryptozoologist and Academy Manufactor. Universes Beyond sets sometimes use it too: In Fallout, cards like Piper Wright, Publick Reporter and Nick Valentine, Private Eye actually say “investigate” to match the detective-style flavor.

Wizards recently shifted towards making Clue tokens without actually using the word “investigate”. For example, in the Avatar: The Last Airbender set, cards like Forecasting Fortune Teller create Clues but avoid the keyword — likely because bending elements and solving puzzles isn’t exactly the same as detective work.

Today, investigate is still very much part of Magic, just used where it makes sense. Whenever the game wants players to solve a murder or follow a trail of clues, Wizards has this mechanic ready to go. While investigate isn’t featured in every set, it continues to show up in mystery-themed releases that let us play detective on the battlefield.

Is Investigate an Activated Ability? A Triggered Ability?

Investigate isn’t an activated or triggered ability on its own — it’s a keyword action. That means it works more like an instruction in the middle of a spell or ability, similar to “draw a card”. You’re not activating or triggering investigate itself; something else is telling you to do it. For example, if a card says “Whenever a creature dies, investigate,” the triggered ability is the part that starts with “whenever”. Investigating is just the result when that trigger resolves. And if a card says “: Investigate,” like Magnifying Glass, that whole line is the activated ability that causes you to investigate.

So investigate never sits on the stack by itself, and you can’t respond to just “investigate” happening — you can only respond to the spell or ability that tells you to do it. Think of investigating simply as the action of creating a Clue token. The ability might be triggered or activated, but the actual keyword is just the effect.

Can You Counter Investigate?

You can’t directly counter the act of investigating, because investigate isn’t a spell or a standalone ability on the stack. It’s part of another spell or ability resolving. So, there’s no moment where a player “casts” investigate for you to hit with a counterspell. If you want to stop someone from getting a Clue token, you have to counter the spell or ability that causes them to investigate in the first place — like countering an Expose Evil, or using a stifle effect like Disallow to stop a triggered ability that would make a player investigate.

Once a spell or ability starts resolving and says “investigate”, the Clue token is made right away, and it’s too late to respond. You can still counter the activated ability of a Clue itself, but that’s completely separate.

So, in short: You can’t counter the investigate action directly, you can only counter whatever is telling someone to investigate.

What Sets Have Investigate?

Investigate has only appeared in a few Magic: The Gathering releases. Here are the main sets where you’ll find cards that investigate:

• Shadows over Innistrad (2016) – First and largest wave of investigate cards like Thraben Inspector and Tireless Tracker.
• Innistrad: Midnight Hunt (2021) – Small comeback with flavor cards like Secrets of the Key and Eloise, Nephalia Sleuth.
• Modern Horizons 2 (2021) – Added key Clue support, including Lonis, Cryptozoologist and Academy Manufactor.
• Universes Beyond: Fallout (2024) – Characters such as Piper Wright, Publick Reporter bring the keyword back.
• Murders at Karlov Manor (2024) – A full murder-mystery set heavily featuring investigate.

While other sets sometimes create Clue tokens without the keyword, these sets actually use investigate by name.

Did They Remove Investigate from the Game?

No — investigate is still in the game. Wizards of the Coast never removed it from the rules or changed how older cards work. It just doesn’t show up very often, which made some players think it was gone. Instead, investigate is what designers call a deciduous mechanic — it returns only when a set has a mystery or detective theme that makes sense for Clues.

Do All Clue Cards Investigate?

Not all Clue cards investigate. Every time you investigate, you create a Clue token. But the opposite isn’t always true. Some cards simply say “create a Clue token” without using the word investigate, and in those cases, you have not investigated.

This matters for cards that specifically care about the act of investigating. For example, Erdwal Illuminator triggers only when you actually investigate. If a spell just gives you a Clue token directly, Illuminator won’t interact, even though you still get the token. While investigate always results in a Clue, making a Clue doesn’t always count as investigating, and that difference can change how your synergies play out.

How Does Investigate Work with Token Doublers?

Investigate works great with token doublers because Clue tokens are still tokens. If you control something like Parallel Lives, Anointed Procession, or Doubling Season, every time you investigate you’ll create extra Clues instead of just one. For example, if you cast a spell that makes you investigate and you have Parallel Lives out, you’ll get two Clue tokens instead of one, and any effects that care about how many Clues you control get even stronger.

This also works when you investigate multiple times. If a card like Erdwal Illuminator gives you an extra investigate each turn, a token doubler will double each of those Clue tokens. And fun cards like Academy Manufactor can turn every investigate into three different tokens — one Clue, one Food, and one Treasure — which token doublers can multiply even further. Put simply: Investigate plus token doubling leads to a lot of artifacts fast, and usually a lot of card draw soon after.

Best Investigate Cards

Budget-Friendly Early Game Investigators

Sometimes you just need to start gathering clues from turn 1. Thraben Inspector is a perfect example, giving you a cheap body and a Clue token to crack later for more cards. It’s one of the best white commons ever printed for a reason. Meanwhile, Hard Evidence gets you a sturdy Crab token to block early attacks plus a Clue on top. These cards are efficient tools for getting your investigation rolling early and smoothly.

Creatures That Turn Clues into Power

Some cards don’t just investigate — they reward you for sacrificing those Clues later. Tireless Tracker grows stronger every time you crack a Clue, turning card draw into a fast-growing threat. Eloise, Nephalia Sleuth brings even more value by letting you surveil whenever any token you control is sacrificed, helping you dig deeper and set up future plays. They turn your detective work into a win condition.

Clue Commanders

Some investigate cards are powerful enough to build around them.

Morska, Undersea Sleuth gives you Clues every upkeep and grows when you draw extra cards, making it a steady card advantage engine. Lonis, Cryptozoologist turns every creature into another Clue and eventually lets you steal cards from opponents–always a fan-favorite move. If you like a more tactical style, Inquisitor Greyfax supports your team while tapping down threats and generating Clues as a bonus. And Teysa, Opulent Oligarch builds a small army of flying spirits when Clues hit the graveyard. Each of them offers a different way to lead a clue-based deck to victory.

Token Engines and Big Payoffs

Investigate gets really wild once you start multiplying tokens. Academy Manufactor upgrades every Clue into a Clue, a Food, and a Treasure, tripling your resources and letting you snowball out of control. Tamiyo's Journal slowly builds a pile of Clues and then turns three of them into any card you want, which is a huge power spike in longer games.

Investigating Through Combat

If your plan is to stay aggressive while still gathering information, Ongoing Investigation is a great fit. It creates Clues whenever your creatures connect in combat, letting you push damage now and draw cards later. It can even investigate again by exiling creatures from your graveyard, giving you a backup plan when the board gets messy. It keeps pressure going without ever running out of steam.

Investigate Payoffs

Clue decks shine when you start adding cards that reward you for making or cracking those tokens. Some payoffs care about the act of investigating, while others reward you for simply having or sacrificing Clues. Once you get a few of these pieces on the battlefield, the value starts stacking up fast.

Take Erdwal Illuminator, for example — a card we’ve talked about a lot already. It doesn’t look flashy, but the first time you investigate each turn, it gives you a bonus Clue for free. In a deck that can investigate during your own turn and your opponents’ turns, that adds up incredibly quickly.

Other cards focus on what you do with Clues once they’re out. Graf Mole turns every Clue you sacrifice into a chunk of lifegain, helping you stay healthy while drawing cards. Fleeting Memories gives you a sneaky alternate win condition by milling your opponent whenever you crack a Clue. And Briarbridge Patrol lets you cheat a big creature into play if you sacrifice three or more Clues in a single turn — which feels amazing once you set it up.

There are also cards that multiply your resources as you collect Clues. Ulvenwald Mysteries spits out Clues when your nontoken creatures die, then turns each sacrificed Clue into a soldier token. Tamiyo's Journal gives you a Clue every turn and eventually lets you tutor any card from your deck once you’ve gathered enough of them. Academy Manufactor might be the wildest payoff of all, transforming every Clue you’d create into a Clue, a Food, and a Treasure — three times the value with a single trigger.

Finally, because Clues are artifacts, they pair perfectly with general artifact synergies. Cards like Sai, Master Thopterist help you turn them into even more creature tokens, while engines such as Time Sieve and Grinding Station let you cash them in for extra turns or milling power.

The Search Is Over

Deduce | Illustration by Quintin Gleim

From Shadows over Innistrad to modern Commander builds, Clues keep finding new ways to matter.

Unfortunately, its clear WotC doesn’t want to use investigate as an evergreen mechanic for generating Clue tokens; they’d rather save it for whenever the set theme or lore adheres to it. I really like the mechanic though, and would love to have all cards that create Clue tokens just say investigate.

What’s your favorite investigate or Clue card to play with? Let me know in the comments, and if you enjoyed this deep dive, be sure to follow us on social media so you don’t miss the next article.

Thanks for reading!