Leda the Mastermind

+1: Look at the top three cards from target player's library and exile one of them, then put the rest back in any order.
-2: Draw a card. Until your next turn, whenever a creature attacks, put two -1/-1 counters on it.
-5: You get an emblem with "You may play cards exiled with this card without paying their mana cost for as long as they stay in exile."