Megumin, Arch Wizard

Megumin, Arch Wizard enters the battlefield
with {x} explosion counters on it. At the
beginning of your end step put an explosion
counter on Megumin, Arch Wizard.
{t}, Remove {x} explosion counters on Megumin,
Arch Wizard. Deal {x} damage split among to any target. You may only cast trigger this ability once.
Megumin, Arch Wizard can't attack.