blue, black, and/or red creature cards in your graveyard have unearth. the unearth cost is equal to the card's mana cost. (pay the card's mana cost: return it to the battlefield. the creature gains haste. exile it at the beginning of the next end step or if it would leave the battlefield. unearth only as a sorcery.) whenever you roll chaos, put target creature card from a graveyard onto the battlefield under your control.