Crumbling Ashes [Eventide] Aura whenever either of those creatures

whenever either of those creatures deals combat damage

Set: Shards of Alara Type: Instant Rarity: Rare Cost: {3}{B}{B} Reveal the top card of your library and put that card into your hand

Set: Amonkhet Invocations Type: Creature — Avatar Rarity: Mythic Cost: {6}{B}{B} If there are ten or more creature cards total in all graveyards

among any of the creatures it's being blocked by or is blocking

Set: Zendikar Type: Creature — Snake Rarity: Mythic Cost: {1}{G} Landfall — Whenever a land enters the battlefield under your control

Crumbling Ashes [Eventide] Aura whenever either of those creaturesSet: Eventide Type: Enchantment Rarity: Uncommon Cost: {1}{B} At the beginning of your upkeep, destroy target creature with a 1 1 counter on it. "I was there to watch my brothers' quenching. I drew the slightest warmth from their dying rage." Illulia of Nighthearth