Yedora, Grave Gardener + Phyrexian Altar + Dulcet Sirens

Yedora, Grave Gardener

Phyrexian Altar

Dulcet Sirens

How it works

1. Activate Phyrexian Altar by sacrificing Dulcet Sirens, adding .
2. When Dulcet Sirens dies, Yedora triggers, returning Dulcet Sirens from your graveyard to the battlefield face down as a Forest land.
3. Activate Dulcet Sirens by tapping it, adding .
4. Activate Dulcet Sirens's morph ability by paying , turning it face up.
5. Repeat.

This clever setup transforms Phyrexian Altar and Yedora, Grave Gardener into a self-sustaining ecosystem where sacrifice is merely a temporary state of being. When you feed Dulcet Sirens to the Altar for mana, Yedora’s static ability immediately steps in to catch it, replanting it onto the battlefield as a face-down Forest land. From there, this new land-creature can tap for green mana to help pay for the {U} required to turn Dulcet Sirens face up via its morph ability—using the very mana you generated from the sacrifice, or cycling it through. Because turning a morph creature face up restores its original identity and allows the loop to begin anew, you get an infinite engine for sacrifice, leaves-the-battlefield triggers, and endless green mana.