Nim Deathmantle + Ashnod's Altar + Pelakka Wurm + Trudge Garden + Primal Vigor

Nim Deathmantle

Ashnod's Altar

Pelakka Wurm

Trudge Garden

Primal Vigor

How it works

1. Activate Ashnod's Altar by sacrificing Pelakka Wurm, adding CC.
2. When Pelakka Wurm dies, its second ability and Nim Deathmantle trigger.
3. Resolve the Pelakka Wurm trigger, causing you to draw a card.
4. Resolve the Nim Deathmantle trigger from step 2, causing you to pay 4 to return Pelakka Wurm from your graveyard to the battlefield, and attach Nim Deathmantle to it.
5. When Pelakka Wurm enters the battlefield, its first ability triggers, causing you to gain 7 life.
6. Trudge Garden triggers, causing you to pay 2 to create two 4/4 Fungus Beast creature tokens.
7. Activate Ashnod's Altar twice by sacrificing the Fungus Beasts, adding CCCC.
8. Repeat.

This engine turns the life and death of Pelakka Wurm into a self-sustaining loop by feeding its sacrifices back into the machine. Ashnod's Altar provides the initial mana and sacrifice outlet, while Nim Deathmantle catches the Wurm as it dies, bringing it right back to the battlefield for just four mana. Every time the Wurm re-enters, it gains you 7 life, which triggers Trudge Garden to generate a Fungus Beast; thanks to Primal Vigor doubling those tokens, sacrificing them back to Ashnod's Altar yields more than enough mana to keep the entire cycle running indefinitely while churning through your library.