Nim Deathmantle + Ashnod's Altar + Ashaya, Soul of the Wild + Felidar Retreat
Nim Deathmantle
Ashnod's Altar
Ashaya, Soul of the Wild
Felidar Retreat
Requires
Nim Deathmantle must be on the battlefield.
Ashnod's Altar must be on the battlefield.
Ashaya, Soul of the Wild must be on the battlefield.
Felidar Retreat must be on the battlefield.
Mana needed: 
Steps
- Activate Ashnod's Altar by sacrificing Ashaya, adding .
- When Ashaya dies, Nim Deathmantle triggers, causing you to pay
to return Ashaya from your graveyard to the battlefield, and attaching Nim Deathmantle to it. - When Ashaya enters the battlefield, Felidar Retreat triggers, creating a 2/2 Cat Beast creature token.
- Activate Ashnod's Altar by sacrificing the creature token, adding .
- Repeat.
- If you control a nontoken creature that has haste, you may instead sacrifice it, and then tap it each iteration to get infinite green mana and colorless mana.
Results
Infinite colorless mana. Infinite death triggers. Infinite ETB. Infinite green mana. Infinite landfall triggers. Infinite LTB. Infinite sacrifice triggers.
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