Ancient Adamantoise + Nim Deathmantle + Umbral Collar Zealot + Amulet of Vigor

Ancient Adamantoise

Nim Deathmantle

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 Nim Deathmantle trigger.
3. Resolve the Nim Deathmantle trigger, causing you to pay 4 to return Ancient Adamantoise from your graveyard to the battlefield and attach Nim Deathmantle to it.
4. Resolve the Ancient Adamantoise trigger, creating ten Treasure tokens.
5. When the Treasures enter, Amulet of Vigor triggers ten times, untapping the Treasures.
6. Resolve the Umbral Collar Zealot ability.
7. Activate four Treasures by tapping and sacrificing them, adding 4.
8. Repeat.

This loop turns a clever redirection effect into an engine for infinite mana and resources. You use Umbral Collar Zealot to sacrifice Ancient Adamantoise, whose replacement effect ensures it absorbs all damage meant for your board while its death trigger floods you with ten tapped Treasure tokens. Thanks to Amulet of Vigor, those Treasures instantly untap upon entry, providing the exact {4} needed to pay for Nim Deathmantle's triggered ability and return Ancient Adamantoise straight back to the battlefield with the Equipment attached. Repeating this cycle allows you to sacrifice the Adamantoise over and over, generating infinite death triggers, surveil power, and net-positive mana with every iteration.