Siegehold of Krurr-Ghor

When Siegehold of Krurr-Ghor enters play, you
may reveal an instant card from your hand. If you
don't, it enters play tapped.

{t}: Add {r} or {g}.

{1}{r/g}, {t}: Add {r}{g}. Until end of turn, you may
cast instant spells from exile.