Metamorphosis Fanatic + Body Double + Ashnod's Altar

Metamorphosis Fanatic

Body Double

Ashnod's Altar

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 Ashnod's Altar by sacrificing Metamorphosis Fanatic, adding CC.
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 Ashnod's Altar by sacrificing Body Double, adding CC.
7. Resolve the Body Double ability, returning Metamorphosis Fanatic from your graveyard to the battlefield.
8. Repeat from step 2.

This elegant loop uses Ashnod's Altar as the engine to repeatedly sacrifice our recurring threats, generating an infinite supply of colorless mana alongside endless creature entry, departure, and death triggers. The magic hinges on a perpetual exchange between Metamorphosis Fanatic and Body Double; whenever one enters the battlefield, its triggered ability reaches into the graveyard to pull back the other. Because Body Double enters as a fresh copy of Metamorphosis Fanatic, it seamlessly replaces the original and keeps the recursion engine turning endlessly.