Activate Ashnod's Altar by sacrificing Doomed Traveler, adding {C}{C}.
When Doomed Traveler dies, it and Nim Deathmantle triggers.
Resolve the Doomed Traveler trigger, creating a 1/1 Spirit creature token.
Activate Ashnod's Altar by sacrificing the Spirit, adding {C}{C}.
Resolve the Nim Deathmantle trigger from step 2, causing you to pay {4} to return Doomed Traveler from your graveyard to the battlefield, and attach Nim Deathmantle to it.
Repeat.

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite sacrifice triggers

Nim Deathmantle

Ashnod's Altar

Doomed Traveler

Cast Doomed Traveler by paying {W}.
Doomed Traveler enters the battlefield, triggering Veteran's Armaments, attaching it to Doomed Traveler.
Activate Phyrexian Altar by sacrificing Doomed Traveler, adding {W}.
Doomed Traveler dies, triggering itself and Koll.
Resolve Doomed Traveler's trigger, creating a 1/1 Spirit token.
Resolve Koll's trigger, returning Doomed Traveler from your graveyard to your hand.
Repeat.
Once you have infinite creature tokens, you may activate Phyrexian Altar any number of times, adding infinite mana.

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