Thief of Sanity
From Ravnica: Clue Edition set
Thief of Sanity
Creature — Specter
2/2
Flying
Whenever this creature deals combat damage to a player, look at the top three cards of that player's library, exile one of them face down, then put the rest into their graveyard. You may cast that card for as long as it remains exiled, and mana of any type can be spent to cast that spell.
