Kemetra, Vizier of Pain

+2: Put two -1/-1 counters on a creature you control. If it dies, draw two cards; if it doesn't, deal 2 damage to target opponent.
-2: Distribute two -1/-1 counters among up to two creatures, then Proliferate.
-7: Gain control of all creatures with a -1/-1 counter. At the beginning of your upkeep put a -1/-1 counter on each creature you don't own.