Ancient Adamantoise + Enduring Renewal + Umbral Collar Zealot + Amulet of Vigor

Ancient Adamantoise

Enduring Renewal

Umbral Collar Zealot

Amulet of Vigor

How it works

1. Activate Umbral Collar Zealot by sacrificing Ancient Adamantoise.
2. When Ancient Adamantoise dies, it and Enduring Renewal trigger.
3. Resolve the Enduring Renewal trigger, returning Ancient Adamantoise from your graveyard to your hand.
4. Resolve the Ancient Adamantoise trigger, creating ten tapped Treasure tokens
5. When the Treasures enter, Amulet of Vigor triggers that many times, untapping them.
6. Resolve the Umbral Collar Zealot ability.
7. Activate eight Treasures by tapping and sacrificing them, adding 5.
8. Cast Ancient Adamantoise by paying 5.
9. Repeat.

This ingenious loop transforms Ancient Adamantoise into a self-sustaining engine by routing its death directly back to your hand via Enduring Renewal. To fuel the recurring casting cost, you sacrifice the colossal turtle to Umbral Collar Zealot, which triggers the creation of ten Treasure tokens. Because those Treasures enter the battlefield tapped, Amulet of Vigor steps in to instantly untap all ten of them, leaving you with more than enough mana to recast the giant and repeat the cycle indefinitely.