Vish Kal, Blood Arbiter (234) [Commander]

Flying, lifelink Sacrifice a creature: Put X +1/+1 counters on Vish Kal, where X is the sacrificed creature's power. Remove all +1/+1 counters from Vish Kal: Target creature gets -1/-1 until end of turn for each +1/+1 counter removed this way.