Activate Ashnod's Altar by sacrificing another nontoken Dragon, adding {C}{C}.
The Dragon dies, triggering Nim Deathmantle, causing you to pay {4} to return the Dragon from your graveyard to the battlefield, and attach Nim Deathmantle to it.
The Dragon enters the battlefield, triggering Lathliss, creating a 5/5 Dragon creature token.
Activate Ashnod's Altar by sacrificing the Dragon token, adding {C}{C}.
Repeat.

Infinite death triggers

Infinite ETB

Infinite LTB

Infinite sacrifice triggers

Lathliss, Dragon Queen

Nim Deathmantle

Ashnod's Altar

Cast Dismantle by paying {2}{R}, destroying Eternity Vessel, and putting a number of charge counters on Dragonspark Reactor equal to the number Eternity Vessel had.
Activate Dragonspark Reactor by paying {4} and sacrificing it, dealing damage equal to the number of charge counters on it to an opponent and up to one target creature.
The opponent loses the game due to having 0 or less life.

Near-infinite damage to target opponent

Target opponent loses the game

Eternity Vessel

Dragonspark Reactor

Dismantle

Activate Ashnod's Altar by sacrificing Ganax, adding {C}{C}.
Ganax dies, triggering Nim Deathmantle, causing you to pay {4} to return Ganax from your graveyard to the battlefield, and attach Nim Deathmantle to it.
Ganax enters the battlefield, creating a Treasure token.
Activate the Treasure token by tapping and sacrificing it, adding {2}.
Repeat.

Ganax, Astral Hunter

Goldspan Dragon

Activate Ashnod's Altar by sacrificing Prosperous Innkeeper, adding {C}{C}.
When Prosperous Innkeeper dies, Nim Deathmantle triggers, causing you to pay {4} to return Prosperous Innkeeper from your graveyard to the battlefield, and attach Nim Deathmantle to it.
When Prosperous Innkeeper enters the battlefield, it triggers, creating a Treasure artifact token.
Activate the Treasure by tapping and sacrificing it, adding {2}.
Repeat.

Prosperous Innkeeper

Activate Black Market Tycoon by tapping it, creating two Treasure tokens.
Activate both Treasure tokens by tapping and sacrificing them, adding {4}.
Activate Black Market Tycoon by paying {3} and untapping it, giving itself +2/+2 until end of turn.
Repeat.

Infinite colored mana

Infinitely large Black Market Tycoon until end of turn

Infinite Treasure tokens

Infinite untap of creatures you control

Infinite mana creatures you control can produce

Infinitely large creature until end of turn

Xorn

Black Market Tycoon

Umbral Mantle

Infinite +1/+1 counters on Jolene

Jolene, the Plunder Queen

Activate Ashnod's Altar by sacrificing Dryad Arbor, adding {C}{C}.
When Dryad Arbor dies, Nim Deathmantle triggers, causing you to pay {4} to return Dryad Arbor from your graveyard to the battlefield, and attaching Nim Deathmantle to it.
When Dryad Arbor enters the battlefield, Nesting Dragon triggers, creating a 02/ Dragon Egg creature token.
Activate Ashnod's Altar by sacrificing the Dragon Egg, adding {C}{C}.
When the Dragon Egg dies, it triggers, creating a 2/2 Dragon creature token.
Repeat.

Infinite landfall triggers

Infinite colorless mana

Infinite creature tokens

Dryad Arbor

Nesting Dragon

Activate Ashnod's Altar by sacrificing Ashaya, adding {C}{C}.
When Ashaya dies, Nim Deathmantle triggers, causing you to pay {4} to return Ashaya from your graveyard to the battlefield, and attaching Nim Deathmantle to it.
When Ashaya enters the battlefield, Nesting Dragon triggers, creating a 0/2 Dragon Egg creature token.
Activate Ashnod's Altar by sacrificing the Dragon Egg, adding {C}{C}.
When the Dragon Egg dies, it triggers, creating a 2/2 Dragon creature token.
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.

Infinite green mana

Ashaya, Soul of the Wild

Activate Ashnod's Altar by sacrificing another nontoken creature, adding {C}{C}.
When the creature dies, Nim Deathmantle triggers. Choose not to pay.
Activate Xu-Ifit by tapping it, returning a creature from your graveyard to the battlefield.
Activate Ashnod's Altar by sacrificing Xu-Ifit, adding {C}{C}.
When Xu-Ifit dies, Nim Deathmantle triggers, causing you to pay {4} to return it from your graveyard to the battlefield and attach Nim Deathmantle to it.
Repeat.

Xu-Ifit, Osteoharmonist

Dragonlord Kolaghan

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