Cursed Energy Explosion

Put a +1/+1 counter on target creature, the double the +1/+1 counters on that creature.

Flashback {8}{g}{g}. This spell costs {x} less to cast this way, where X is the greatest mana value of a commander you own
on the battlefield or in the command zone.
(You mat cast this card from your graveyard
for a flashback cost, then exile it.)