Phyrexian Altar + Wormfang Drake + Metamorphosis Fanatic

Phyrexian Altar

Wormfang Drake

Metamorphosis Fanatic

How it works

1. Cast Wormfang Drake by paying its mana cost.
2. When Wormfang Drake enters, its first ability triggers, exiling Metamorphosis Fanatic.
3. Activate Phyrexian Altar by sacrificing Wormfang Drake.
4. When Wormfang Drake dies, its second ability triggers, returning Metamorphosis Fanatic from exile to the battlefield.
5. When Metamorphosis Fanatic enters, it triggers, returning Wormfang Drake from your graveyard to the battlefield.
6. When Wormfang Drake enters, its first ability triggers, exiling Metamorphosis Fanatic.
7. Repeat from step 3.

This elegant loop harnesses a continuous cycle of life and death, pivoting entirely on Wormfang Drake's entrancing ability to temporarily stash away another creature. When you sacrifice Wormfang Drake to Phyrexian Altar, its departure instantly frees the exiled Metamorphosis Fanatic, whose own entry trigger immediately plucks Wormfang Drake right back out of your graveyard. Because Metamorphosis Fanatic's return triggers a fresh exile of itself to feed the Drake's endless hunger, the Altar readily converts every single iteration of this cycle into an endless supply of colored mana.