Eldrazi Firebreather

Devoid
Eldrazi Firebreather enters the battlefield with X +1/+1 counters on it.
Flying
{2}{r}: Eldrazi Firebreather gets +1/+0 until end of turn for each colorless creature you control.
{t}: Eldrazi Firebreater deals X damage to target creature, where X is its power.
Whenever a card leaves exile, untap Eldrazi Firebreather.