Bloody Crow of Cainhurst

Vigilance, Waltz. Indestructible if a creature you controlled died this turn or last turn. Whenever you or it lose life, put a Blood counter on it. You may remove Blood counters:
1 - +1/+0 until end of turn.
1 - Gains Lifelink until end of turn.
2 - Gains First Strike until end of turn.
3 - Gains Flying until end of turn.

{r}, Sacrifice a creature: Add a Blood counter.
{r}: Deal 1 damage to target creature. Activate only once per combat.