Crobat

You may sacrifice a creature named Golbat rather than pay this spells mana cost.
Flash, bloodthirst 3 (If an opponent was dealt damage this turn, this creature enters the battlefield with three +1/+1 counters on it.)
When Crobat enters the battlefield, it deals
damage equal to its power to target creature.
First strike, flying, vigilance, haste.
Crobat can't have -1/-1 counters placed on it.
{t}: Crobat deals damage equal to its power to
target cr