Vessel-eater

Flying
Devour 2 (As this creature enters the battlefield, you
may sacrifice any number of creatures. This permanent enters the battlefield with two +1/+1 counters on it for
each creature sacrificed this way.)
This card can't be blocked by artifact creatures.
When this card enters the battlefield put X 1/1
blue Spirit tokens with flying onto the battlefield,
where X is the power of this creature.