Metamorphosis Fanatic + Body Double + Yahenni, Undying Partisan

Metamorphosis Fanatic

Body Double

Yahenni, Undying Partisan

How it works

1. Cast Metamorphosis Fanatic by paying 4.
2. When Metamorphosis Fanatic enters the battlefield, it triggers, targeting Body Double.
3. Holding priority, activate Yahenni by sacrificing Metamorphosis Fanatic.
4. Resolve the Metamorphosis Fanatic ability, returning Body Double from your graveyard to the battlefield as a copy of Metamorphosis Fanatic.
5. When Body Double enters the battlefield, it triggers, targeting Metamorphosis Fanatic.
6. Holding priority, activate Yahenni by sacrificing Body Double.
7. Resolve the Body Double ability, returning Metamorphosis Fanatic from your graveyard to the battlefield.
8. Repeat from step 2.

This cunning loop relies on an endless exchange from the graveyard, turning a single pair of creatures into an everlasting cycle of rebirth. By using Metamorphosis Fanatic's enter-the-battlefield ability to pull Body Double out of the graveyard—choosing to have Body Double enter as a copy of the Fanatic itself—you set up a self-sustaining loop where each creature pulls the other back from the dead. Meanwhile, Yahenni, Undying Partisan serves as the willing executioner in the yard, providing the necessary sacrifice outlet to send each creature back to the graveyard while growing steadily larger from the relentless death triggers.