Shepherd of the Cosmos + Kaya's Ghostform + Phyrexian Altar

Shepherd of the Cosmos

Kaya's Ghostform

Phyrexian Altar

How it works

1. Activate Phyrexian Altar by sacrificing Shepherd of the Cosmos, adding one mana of any color.
2. When Shepherd of the Cosmos dies, Kaya's Ghostform triggers, returning Shepherd of the Cosmos from your graveyard to the battlefield.
3. When Shepherd of the Cosmos enters the battlefield, it triggers, returning Kaya's Ghostform from your graveyard to the battlefield attached to Shepherd of the Cosmos.
4. Repeat.

This elegant loop turns the modest resurrection of Shepherd of the Cosmos into an endless engine of creation, fueled cleanly by Phyrexian Altar to churn out infinite colored mana and an unceasing stream of death and entry triggers. The secret to sustaining this cycle lies in Kaya's Ghostform, whose proactive enchantment steps in whenever the Shepherd perishes, instantly returning it to the battlefield and letting its entry ability fish the Ghostform right back out of the graveyard to reattach.