Yedora, Grave Gardener + Phyrexian Altar + Kin-Tree Warden

Yedora, Grave Gardener

Phyrexian Altar

Kin-Tree Warden

How it works

1. Activate Phyrexian Altar by sacrificing Kin-Tree Warden, adding one mana of any color.
2. When Kin-Tree Warden dies, Yedora triggers, returning Kin-Tree Warden from your graveyard to the battlefield face down as a Forest land.
3. Activate Kin-Tree Warden by tapping it, adding .
4. Activate Kin-Tree Warden's morph ability by paying , turning it face up.
5. Repeat.

This elegant loop turns the cycle of life and death into a perpetual mana engine. By feeding Kin-Tree Warden to Phyrexian Altar, you generate a mana while triggering Yedora, Grave Gardener to immediately return the Warden to the battlefield as a face-down Forest. Because the card is now a face-down creature, you can pay its morph cost of {G} (fueled by tapping the Warden for its own green mana or the Altar's payment) to turn Kin-Tree Warden face up again, resetting it so the whole process can repeat indefinitely for infinite colored mana.