Finale of Devastation [Commander Masters]

Set: Commander Masters Type: Sorcery Rarity: Mythic Cost: {X}{G}{G} Some spells sing a quiet tune. Others roar. Search your library and/or graveyard for a creature card with mana value X or less and put it onto the battlefield. If you search your library this way, shuffle. If X is 10 or more, creatures you control get +X/+X and gain haste until end of turn.