Everything in the Spirit Squadron Commander deck: all 100 cards with current prices, what the deck is worth against the sealed price, the 15 new cards, and whether it is worth buying.
Affinity for Spirits (This spell costs {1} less to cast for each Spirit you control.) Flying Whenever Millicent or another nontoken Spirit you control dies or deals combat damage to a player, create a 1/1 white Spirit creature token with flying.
At today's prices the singles come to $57.88, carried by Kami of the Crescent Moon ($8.76), Ghostly Prison ($6.51), Arcane Denial ($2.63). 15 of the 100 cards are new to this deck.
Spirit Squadron is a pretty interesting addition to Commander. It’s the first ever spirit tribal precon and it also brings the best commander for the tribe so far. There have been tons of interesting legendary spirits out there, but none of them have been really tribal in their abilities. Millicent, Restless Revenant is a safe bet for any players that want to build a spirit tribal list.
In combination with the spirit theme, the deck has a strong focus on recursion. Plenty of spells have effects similar to the deck’s commander that allow you to recover from removal and board wipes. Field of Souls and Haunted Library make for great ways to stay one step ahead of your opponents when someone casts a sweeper.
Cards that care about tokens would be a good addition to this deck. Anointed Procession is the first card that comes to mind. Another good addition is Guardian of Faith since its phasing out ability won’t kill your tokens the way exiling and returning to the battlefield would. It’s a very effective way to protect your creatures and tokens, plus it’s considerably cheaper than Teferi's Protection.