Goeshn, Goblin Golem

Whenever you cast a spell, this card becomes a
X/X Artifact creature until end of turn, Where X is the amount of colors you used to cast that spell.
When this card is destroyed, if it is a creature, create X 1/1 goblin tokens and deal X damage to target player, where X is this cards power, then return it to the battlefield.
Never before has destruction been so creative.