Sacrifice Myr Moonvessel to Ashnod's Altar, Adding {C}{C} to your mana pool.
Stack the Myr Moonvessel trigger above the Nim Deathmantle trigger.
Allow the Myr Moonvessel trigger to resolve, adding {C} to your mana pool.
Teysa Karlov makes Myr Moonvessel's death trigger to occur twice adding an additional {C} to your mana pool.
Let the Blood Artist triggers resolve.
Pay for the Nim Deathmantle trigger with {4}, returning Myr Moonvessel to the battlefield equipped with Nim Deathmantle.
Repeat.

Infinite death triggers

Infinite ETB

Infinite lifegain

Infinite lifegain triggers

Infinite lifeloss

Infinite LTB

Infinite sacrifice triggers

Teysa Karlov

Nim Deathmantle

Myr Moonvessel

Ashnod's Altar

Blood Artist

Cast Liturgy of Blood by paying {3}{B}{B}, targeting any indestructible creature.
Holding priority, activate Uyo by paying {2} and returning two lands to your hand from the battlefield, copying Liturgy of Blood.
Resolve the copy of Liturgy of Blood, failing to destroy the targeted creature and adding {B}{B}{B}.
Activate Patron of the Moon by paying {1}, putting two lands onto the battlefield tapped from your hand.
Repeat from step 2.

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