Arcanite Spellbomb

Arcanite Spellbomb enters the battlefield with X
charge counters on it.

{t}: Put a charge counter on Arcanite Spellbomb.

{t}, Sacrifice Arcanite Spellbomb: Destroy each
nonland permanent with mana value equal to or
less than the number of charge counters on Arcanite Spellbomb.