Activate Ashnod's Altar by sacrificing Phyrexian Walker, adding {C}{C}.
When Phyrexian Walker dies, Nim Deathmantle triggers, choose not to pay for the trigger.
Activate Ashnod's Altar by sacrificing Ruxa, adding {C}{C}.
When Ruxa dies, Nim Deathmantle triggers, causing you to pay {4} to return Ruxa from your graveyard to the battlefield, and attach Nim Deathmantle to it.
When Ruxa enters the battlefield, its first ability triggers, returning Phyrexian Walker to your hand from your graveyard.
Cast Phyrexian Walker by paying {0}.
Repeat.

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite sacrifice triggers

Infinite storm count

Ruxa, Patient Professor

Nim Deathmantle

Ashnod's Altar

Phyrexian Walker

Activate Ashnod's Altar by sacrificing Memnite, adding {C}{C}.
When Memnite dies, Nim Deathmantle triggers, choose not to pay for the trigger.
Activate Ashnod's Altar by sacrificing Ruxa, adding {C}{C}.
When Ruxa dies, Nim Deathmantle triggers, causing you to pay {4} to return Ruxa from your graveyard to the battlefield, and attach Nim Deathmantle to it.
When Ruxa enters the battlefield, its first ability triggers, returning Memnite to your hand from your graveyard.
Cast Memnite by paying {0}.
Repeat.

Memnite

Activate Ashnod's Altar by sacrificing Kobolds of Kher Keep, adding {C}{C}.
When Kobolds of Kher Keep dies, Nim Deathmantle triggers, choose not to pay for the trigger.
Activate Ashnod's Altar by sacrificing Ruxa, adding {C}{C}.
When Ruxa dies, Nim Deathmantle triggers, causing you to pay {4} to return Ruxa from your graveyard to the battlefield, and attach Nim Deathmantle to it.
When Ruxa enters the battlefield, its first ability triggers, returning Kobolds of Kher Keep to your hand from your graveyard.
Cast Kobolds of Kher Keep by paying {0}.
Repeat.

Kobolds of Kher Keep

Activate Ashnod's Altar by sacrificing Crookshank Kobolds, adding {C}{C}.
When Crookshank Kobolds dies, Nim Deathmantle triggers, choose not to pay for the trigger.
Activate Ashnod's Altar by sacrificing Ruxa, adding {C}{C}.
When Ruxa dies, Nim Deathmantle triggers, causing you to pay {4} to return Ruxa from your graveyard to the battlefield, and attach Nim Deathmantle to it.
When Ruxa enters the battlefield, its first ability triggers, returning Crookshank Kobolds to your hand from your graveyard.
Cast Crookshank Kobolds by paying {0}.
Repeat.

Crookshank Kobolds

Activate Ashnod's Altar by sacrificing Crimson Kobolds, adding {C}{C}.
When Crimson Kobolds dies, Nim Deathmantle triggers, choose not to pay for the trigger.
Activate Ashnod's Altar by sacrificing Ruxa, adding {C}{C}.
When Ruxa dies, Nim Deathmantle triggers, causing you to pay {4} to return Ruxa from your graveyard to the battlefield, and attach Nim Deathmantle to it.
When Ruxa enters the battlefield, its first ability triggers, returning Crimson Kobolds to your hand from your graveyard.
Cast Crimson Kobolds by paying {0}.
Repeat.

Combos with "Ruxa, Patient Professor"