Corpse Dance [Tempest] Golem whenever either of those creatures

whenever either of those creatures deals combat damage

Set: Mirrodin Type: Creature — Human Wizard Rarity: Rare Cost: {1}{U}{U} At the beginning of each opponent's upkeep

choose a nonland card name

Set: Beta Edition Type: Artifact Rarity: Rare Cost: {4} Red creatures get +1/+1

you may gain control of target creature for as long as you control Roil Elemental

Corpse Dance [Tempest] Golem whenever either of those creaturesSet: Tempest Type: Instant Rarity: Rare Cost: {2}{B} Buyback {2} (You may pay an additional {2} as you cast this spell. If you do, put this card into your hand as it resolves.) Return the top creature card of your graveyard to the battlefield. That creature gains haste until end of turn. Exile it at the beginning of the next end step.