Cast the artifact creature by paying {1}, causing it to enter the battlefield with a +1/+1 counter on it.
Activate Together Forever by paying {1}, targeting the artifact creature.
Activate Krark-Clan Ironworks by sacrificing the artifact creature, adding {C}{C}.
When the creature dies, Together Forever triggers, returning the artifact creature from your graveyard to your hand.
Repeat.

Infinite creature LTB

Infinite creature ETB

Infinite creature sacrifice triggers

Infinite death triggers

Infinite storm count

Creature with Mana Cost Equal to {X}

Together Forever

Krark-Clan Ironworks

Activate Krark-Clan Ironworks by sacrificing the legendary artifact, adding {C}{C}.
Yomiji triggers, returning that card from your graveyard to your hand.
Cast the legendary artifact by paying {1} or {0}.
Repeat.

Infinite artifact ETB

Infinite artifact LTB

Infinite artifact sacrifice triggers

Infinite colorless mana

Legendary Artifact Castable for {0} or {1}

Yomiji, Who Bars the Way

Cast Sword of the Meek by paying {2}.
When Sword of the Meek enters, its living weapon ability granted to it by Ekthi triggers.
Holding priority, activate Krark-Clan Ironworks by sacrificing Sword of the Meek.
Resolve the Sword of the Meek trigger, creating a 0/0 Phyrexian Germ creature token. It'll enter as a 1/1 due to Ekthi's static effect.
When the Phyrexian Germ enters, Sword of the Meek triggers, returning Sword of the Meek from your graveyard to the battlefield attached to the Phyrexian Germ.
Repeat from step 2.

Ekthi, Contaminator Priest

Sword of the Meek

Activate Thopter Foundry by paying {1} and sacrificing Sword of the Meek, creating a 1/1 Thopter artifact creature token and gaining 1 life.
The Thopter token enters the battlefield, triggering Sword of the Meek, returning Sword of the Meek to the battlefield equipped to the Thopter.
Activate Krark-Clan Ironworks by sacrificing the Thopter token, adding {C}{C}.
Repeat.

Infinite lifegain

Infinite lifegain triggers

Thopter Foundry

Activate Krark-Clan Ironworks by sacrificing a Clue, adding {C}{C}.
Lonis' second ability triggers, putting a +1/+1 counter on the Spike.
Activate the Spike by paying {2} and removing a +1/+1 counter from it, putting a +1/+1 counter on Lonis.
Lonis' first ability triggers, creating a Clue artifact token.
Repeat.

Infinite +1/+1 counters on a creature

Spike Cycle - {2}, remove a +1/+1 counter: Put a +1/+1 counter

Lonis, Genetics Expert

Activate Ashnod's Altar by sacrificing Sword of the Meek, adding {C}{C}.
Sly Requisitioner triggers, creating a 1/1 Servo artifact creature token.
Sword of the Meek triggers, returning itself from your graveyard to the battlefield attached to the Servo token.
Repeat.

Infinite creature tokens

Sly Requisitioner

Cast Sword of the Meek by paying {2}.
When Sword of the Meek enters, Sokka and Suki's second ability triggers.
Holding priority, activate Krark-Clan Ironworks by sacrificing Sword of the Meek.
Resolve the Sokka and Suki trigger, creating a 1/1 Ally creature token.
When the Ally enters, Sword of the Meek triggers, returning Sword of the Meek from your graveyard to the battlefield attached to the Ally.
Repeat from step 2.

Sokka and Suki

Activate the Equipment by paying its equip cost, attaching it to the creature that is castable for {C}.
Activate Krark-Clan Ironworks by sacrificing the creature, adding {C}{C}.
When the creature dies, Koll triggers, returning the creature from your graveyard to your hand.
Cast the creature by paying its mana cost.
Repeat.

Equipment with Equip Cost = {1}

Creature Castable for {C}

Koll, the Forgemaster

Activate Krark-Clan Ironworks by sacrificing Sword of the Meek, adding {C}{C}.
Activate Sliver Queen by paying {2}, creating a 1/1 Sliver creature token.
The Sliver token enters the battlefield, triggering Sword of the Meek, returning Sword of the Meek from your graveyard to the battlefield and attaching itself to the Sliver token.
Repeat.

Sliver Queen

Cast the instant or sorcery by paying its mana cost.
Holding priority, activate Stella Lee by tapping it, copying the instant or sorcery.
Resolve the copy of the instant or sorcery, untapping Stella Lee.
Repeat from step 2.

Infinite copies of one instant or sorcery

Infinite magecraft triggers

Instant or Sorcery that untaps a Creature

Stella Lee, Wild Card

Cast Moritte either from your hand or from the command zone by paying {2}{G}{U}{U} plus commander tax if applicable. Choose to have it enter as a copy of the persist creature that is still legendary.
Put Moritte into your graveyard due to the legend rule. When it dies, its persist ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it due to its ability. Choose to have it enter as a copy of the persist creature that is still legendary.
Repeat step 2.

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