Karn, Soul of Mirrodin

+2: Exile target creature, then return it to the battlefield under your control with a +1/+1 counter on it.
-X: Creatures you control gain +X/+X until end of turn, and creatures your opponents control gain -X/-X until end of turn.
-15: You get an emblem with: "You can't be attacked, and your opponents can't block your creatures".