This fascinating self-sustaining loop relies on Underworld Breach to give your spells escape, letting you repeatedly cast Malevolent Rumble from your graveyard by funding its exile costs with the cards it mills. Tyvar, Jubilant Brawler makes your setup even smoother with his passive haste-granting ability for creature abilities, while A Realm Reborn turns all your permanents into mana producers to help cover the costs. The Eldrazi Spawn token created by Malevolent Rumble is central to the engine, since sacrificing it for mana and tapping it via A Realm Reborn provides the exact resources needed to keep casting Malevolent Rumble over and over again.