Nim Deathmantle triggers, causing you to pay ({4} magic symbol) 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 ({C} magic symbol) ({C} magic symbol) .
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 creature ETB.
Infinite green mana.
Infinite landfall triggers.
Infinite creature LTB.
Infinite creature sacrifice triggers.
Metadata
Bracket tag
ExhibitionBracket 1+
For any deck
1
2
3
4
5
1 · Exhibition5 · cEDH
Bracket tags are estimated from the cards and results of each combo, as a guideline rather than a strict classification.