Devastating Onslaught + Mana Geyser + Warden of the Eye

Devastating Onslaught

Mana Geyser

Warden of the Eye

How it works

1. Cast Mana Geyser by paying 3, adding for each tapped land your opponents control.
2. Cast Devastating Onslaught by paying 4, creating two token copies of Warden of the Eye with haste.
3. When the Warden of the Eye tokens enter, they trigger, returning Mana Geyser and Devastating Onslaught from your graveyard to your hand.
4. Repeat.

This clever loop begins with Mana Geyser generating a massive influx of red mana by exploiting your opponents' tapped lands, providing the heavy fuel needed for the engine. You then cast Devastating Onslaught to make two token copies of Warden of the Eye, which immediately trigger upon entering the battlefield. Those ETB abilities pluck Mana Geyser and Devastating Onslaught right back out of your graveyard and into your hand, allowing you to replay both spells, net infinite red mana, and repeat the entire sequence indefinitely.