Color Identity: G

Initial Card State
- All permanents on the battlefield.
Steps
- Activate Ashnod's Altar by sacrificing Penumbra Spider, adding ({C} magic symbol)
({C} magic symbol)
. - When Penumbra Spider dies, it and Nim Deathmantle trigger,.
- Resolve the Penumbra Spider trigger, creating a creature token.
- Holding priority, activate Ashnod's Altar by sacrificing a creature token, adding ({C} magic symbol)
({C} magic symbol)
. - Resolve the Nim Deathmantle trigger, causing you to pay ({4} magic symbol)
to return Penumbra Spider from your graveyard to the battlefield and attach Nim Deathmantle to it. - Repeat.
Results
- Infinite death triggers.
- Infinite ETB.
- Infinite LTB.
- Infinite sacrifice triggers.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).