Thief of Sanity 
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Creature - Specter
Flying
Whenever Thief of Sanity deals combat damage to a player, look at the top three cards of that player’s library, exile one of those cards face-down, then put the rest into that player’s graveyard. For as long as the face-down card remains exiled, you may look at it, you may cast it, and you may spend mana as though it were mana of any color to cast it.
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