Aether Wildfire [EVR123] 1st Edition Rainbow Foil Trading Card - Everfest MTG Collectible for Gameplay & Display

Deal 4 arcane damage to target opposing hero.If Aether Wildfire is played during an opponents turn, until end of turn, action card effects that deal arcane damage instead deal that much arcane damage plus X, where X is the damage dealt by Aether Wildfire."