Devastating Onslaught + Mana Geyser + Possessed Skaab

Devastating Onslaught

Mana Geyser

Possessed Skaab

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 Possessed Skaab with haste.
3. When the Possessed Skaab tokens enter, they trigger, returning Mana Geyser and Devastating Onslaught from your graveyard to your hand.
4. Repeat.

This loop relies on generating an immense surplus of red mana through Mana Geyser—fueled by your opponents' tapped lands—to continuously cast Devastating Onslaught. When Devastating Onslaught resolves, it creates two token copies of Possessed Skaab, which immediately flood the battlefield and trigger their enter-the-battlefield abilities. Those triggers allow you to pluck both Mana Geyser and Devastating Onslaught right back out of your graveyard and into your hand, bypassing the Skaabs' usual replacement effect of exiling themselves upon death since the tokens simply vanish at the end step while the spells loop endlessly.