Barrel Full of Bombs

Barrel Full of Bombs enters the battlefield with two time counters on it. At the beginning of your upkeep, remove a time counter. When there are no time counters left on it, sacrifice it and Barrel Full of Bombs deals 6 damage to target creature.
(Barrel Full of Bombs can be the target of an attack, like a player or planeswalker. It's life total is 1 and it cannot gain life.)