MTG >Combos >Card with Free Sacrifice ability +Worldheart Phoenix +Morophon, the Boundless +

Morophon reduces the cost of spells of the chosen type in WUBRG. Sacrifice Worldheart Phoenix You can pay WUBRG to cast Worldheart Phoenix from your graveyard. Since Morophon reduces this cost, you can cast Worldheart Phoenix from your graveyard without paying the mana cost. Repeat process for infinite ETB/Death Trigger.