Emperor of Bones 90/319 (Modern Horizons 3)

At the beginning of combat on your turn, exile up to one target card from a graveyard. {1}{B}: Adapt 2. Whenever one or more +1/+1 counters are put on this creature, put a creature card exiled with this creature onto the battlefield under your control with a finality counter on it. It gains haste. Sacrifice it at the beginning of the next end step.