This ferocious loop lets you rumble through endless combat phases by continuously recycling your spells from the graveyard. Whenever Savage Ventmaw takes to the skies and attacks, it generates a massive influx of red and green mana that sticks around through the phases to fund your extra turns. With your mana secured, Charnelhoard Wurm storms through for combat damage to haul Relentless Assault right back out of your graveyard and into your hand. You then cast Relentless Assault to untap both of your massive attackers and grant yourself another combat step, allowing the entire sequence to repeat indefinitely.