Derevi, Empyrial Tactician + Ancient Adamantoise + Infinite Reflection + Amulet of Vigor + Umbral Collar Zealot

Derevi, Empyrial Tactician

Ancient Adamantoise

Infinite Reflection

Amulet of Vigor

Umbral Collar Zealot

How it works

1. If you haven't cast Derevi from the command zone this game, cast it by paying . Otherwise, activate Derevi by paying 1, putting it from the command zone onto the battlefield.
2. Derevi enters the battlefield as a copy of Ancient Adamantoise due to Infinite Reflection.
3. Activate Umbral Collar Zealot by sacrificing Derevi.
4. Choose to return Derevi from your graveyard to the command zone.
5. When Derevi dies, it triggers, creating ten tapped Treasure tokens.
6. When the Treasures enter the battlefield, Amulet of Vigor triggers that many times, untapping the Treasures.
7. Resolve the Umbral Collar Zealot ability.
8. Activate four Treasures by tapping and sacrificing them, adding 1.
9. Repeat.

This clever loop turns Ancient Adamantoise into a massive engine of creation by using Infinite Reflection to ensure every nontoken creature you control enters as a copy of the Adamantoise. When you bring Derevi, Empyrial Tactician in from the command zone, it enters as another Ancient Adamantoise, which Umbral Collar Zealot can immediately sacrifice to send Derevi back to the command zone and trigger the Adamantoise's death ability for ten tapped Treasure tokens. Thanks to Amulet of Vigor, those Treasures instantly untap upon entry so you can crack four of them for mana to recast Derevi, fueling an endless cycle of sacrifice, treasure generation, and surveil.