Activate Goblin Welder by tapping it, causing you to sacrifice Darksteel Citadel and return Seat of the Synod from your graveyard to the battlefield.
Seat of the Synod enters the battlefield, triggering Retreat to Coralhelm, untapping Goblin Welder.
Activate Seat of the Synod by tapping it, adding {U}.
Activate Goblin Welder by tapping it, causing you to sacrifice Seat of the Synod and return Darksteel Citadel from your graveyard to the battlefield.
Darksteel Citadel enters the battlefield, triggering Retreat to Coralhelm, untapping Goblin Welder.
Activate Darksteel Citadel by tapping it, adding {C}.
Repeat.

Infinite blue mana

Infinite colorless mana

Infinite landfall triggers

Goblin Welder

Retreat to Coralhelm

Seat of the Synod

Darksteel Citadel

Activate Goblin Welder by tapping it, causing you to sacrifice Great Furnace and return Darksteel Citadel from your graveyard to the battlefield.
Darksteel Citadel enters the battlefield, triggering Retreat to Coralhelm, untapping Goblin Welder.
Activate Darksteel Citadel by tapping it, adding {C}.
Activate Goblin Welder by tapping it, causing you to sacrifice Darksteel Citadel and return Great Furnace from your graveyard to the battlefield.
Great Furnace enters the battlefield, triggering Retreat to Coralhelm, untapping Goblin Welder.
Activate Great Furnace by tapping it, adding {R}.
Repeat.

Infinite red mana

Great Furnace

Activate Goblin Welder by tapping it, causing you to sacrifice Ancient Den and return Darksteel Citadel from your graveyard to the battlefield.
Darksteel Citadel enters the battlefield, triggering Retreat to Coralhelm, untapping Goblin Welder.
Activate Darksteel Citadel by tapping it, adding {C}.
Activate Goblin Welder by tapping it, causing you to sacrifice Darksteel Citadel and return Ancient Den from your graveyard to the battlefield.
Ancient Den enters the battlefield, triggering Retreat to Coralhelm, untapping Goblin Welder.
Activate Ancient Den by tapping it, adding {W}.
Repeat.

Infinite white mana

Ancient Den

Activate Prototype Portal by tapping it, creating a token copy of Darksteel Citadel.
When the Darksteel Citadel token enters the battlefield, Retreat to Coralhelm triggers, untapping Prototype Portal.
Repeat.

Infinite colored mana

Infinite Forest tokens

Infinite Plains tokens

Infinite Island tokens

Infinite Mountain tokens

Infinite Swamp tokens

Infinite copies of a specific land

Prototype Portal

Ensoul Artifact

Activate Metalworker by tapping it and revealing at least three artifact cards from your hand, adding at least six {C}.
Activate Urza by paying {6}, creating a token copy of Darksteel Citadel that is a 1/1 Soldier.
When the Darksteel Citadel token enters the battlefield, Retreat to Coralhelm triggers, untapping Metalworker.
Repeat.
If you have four or more artifact cards in hand, this combo nets infinite colorless mana, and you may target any artifact you control to get infinite copies of them.

Infinite creature tokens

Infinite ETB

Infinite creature copies of artifacts you control

Infinite copies of artifacts you control

Urza, Prince of Kroog

Metalworker

Activate Tawnos' second ability by paying {1}{W}{U}{B}, tapping it, sacrificing two artifact tokens and exiling Darksteel Citadel from your graveyard, causing you to create a token of Darksteel Citadel.
When the Darksteel Citadel token enters the battlefield, Retreat to Coralhelm triggers, untapping Tawnos.
Activate the Darksteel Citadel token by tapping it, adding {C}.
Forsaken Monument triggers, adding {C}.
Activate Tawnos' first ability by paying {2} and tapping it, creating a copy of the Darksteel Citadel token and causing you to mill two cards.
Repeat from step 2.

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