Terror of the Tribes

Whenever Terror of the Tribes enters the battlefield, until end of turn you may cast a
creature spell you own from outside the game
and spend mana as though it were any color to
cast it. It is a Goblin in addition to its other types
and gains "Whenever a goblin you control deals
combat damage to an opponent, you may draw a
card. If you do, discard a card." When it, or
Terror of the Tribes leave play, exile them.
"Incoming!" - ?