Flying
At the beginning of each end step, if a creature died this turn, put a carrion counter on Osai Vultures.
Remove two carrion counters from Osai Vultures: Osai Vultures gets +1/+1 until end of turn.
Flying
At the end of any turn in which a creature is placed in the graveyard from play, put a counter on the Vultures. Remove two counters to give Vultures +1/+1 until end of turn.
A sign of battle, the Vultures circle and wait for the victorious to depart.