Darkfeast Bat

Flying
As long as Darkfeast Bat has less than five blood counters on it, it's not a creature.
Whenever you are dealt damage on your turn, put
a blood counter on Darkfeast Bat.
At the end of your turn, as long as Darkfeast Bat
is a creature, it deals X damage to each opponent,
where X equals the number of blood counters on
it.