Dohiri, Mistress of Chaos

+2: Put a colorless Firestone artifact onto the battlefield with "when Firestone leaves the battlefield, it deals 1 damage to target player"
-3: The owner of target permanent shuffles it into his or her library, then draws 2 cards.
-7: You get an emblem with "Whenever a permanent you control leaves the battlefield, this emblem causes 2 points of damage to any target"