Nim Deathmantle + Ashnod's Altar + Dryad Arbor + Retreat to Emeria

Nim Deathmantle

Ashnod's Altar

Dryad Arbor

Retreat to Emeria

How it works

1. Activate Ashnod's Altar by sacrificing Dryad Arbor, adding CC.
2. When Dryad Arbor dies, Nim Deathmantle triggers, causing you to pay 4 to return Dryad Arbor from your graveyard to the battlefield, and attaching Nim Deathmantle to it.
3. When Dryad Arbor enters the battlefield, Retreat to Emeria triggers, creating a 1/1 Kor Ally creature token.
4. Activate Ashnod's Altar by sacrificing the creature token, adding CC.
5. Repeat.

This clever loop transforms Ashnod's Altar into an engine that endlessly recycles Dryad Arbor by feeding it to the Altar for mana. Whenever Dryad Arbor hits the graveyard, Nim Deathmantle steps in to resurrect the land-creature for the exact amount of mana the Altar just produced, keeping the cycle going. Meanwhile, every time Dryad Arbor reenters the battlefield, Retreat to Emeria triggers to spawn a fresh Kor Ally creature token, which you can then sacrifice to Ashnod's Altar to help fund the Deathmantle's resurrection cost and net an endless supply of triggers.