Everything in the Mirror Mastery 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.
Whenever you cast an instant or sorcery spell, you may pay {U}{R}. If you do, copy that spell. You may choose new targets for the copy. Whenever another nontoken creature you control enters, you may pay {G}{U}. If you do, create a token that's a copy of that creature.
At today's prices the singles come to $112.16, carried by Animar, Soul of Elements ($33.68), Homeward Path ($15.60), Collective Voyage ($6.57). 15 of the 100 cards are new to this deck. Draftsim's Commander 2011 review covers whether it is worth the sticker price.