Goblin Welder + Retreat to Coralhelm Combos

7 known combos featuring both cards in Commander

Infinite landfall triggers Infinite blue mana Infinite red mana Infinite colorless mana Infinite white mana

Combo 1 with Seat of the Synod + Great Furnace

Results: Infinite blue mana · Infinite landfall triggers · Infinite red mana
Steps
  1. Activate Goblin Welder by tapping it, causing you to sacrifice Great Furnace and return Seat of the Synod from your graveyard to the battlefield.
  2. Seat of the Synod enters the battlefield, triggering Retreat to Coralhelm, untapping Goblin Welder.
  3. Activate Seat of the Synod by tapping it, adding {U}.
  4. Activate Goblin Welder by tapping it, causing you to sacrifice Seat of the Synod and return Great Furnace from your graveyard to the battlefield.
  5. Great Furnace enters the battlefield, triggering Retreat to Coralhelm, untapping Goblin Welder.
  6. Activate Great Furnace by tapping it, adding {R}.
  7. Repeat.

Combo 2 with Seat of the Synod + Darksteel Citadel

Results: Infinite blue mana · Infinite colorless mana · Infinite landfall triggers
Show steps
  1. Activate Goblin Welder by tapping it, causing you to sacrifice Darksteel Citadel and return Seat of the Synod from your graveyard to the battlefield.
  2. Seat of the Synod enters the battlefield, triggering Retreat to Coralhelm, untapping Goblin Welder.
  3. Activate Seat of the Synod by tapping it, adding {U}.
  4. Activate Goblin Welder by tapping it, causing you to sacrifice Seat of the Synod and return Darksteel Citadel from your graveyard to the battlefield.
  5. Darksteel Citadel enters the battlefield, triggering Retreat to Coralhelm, untapping Goblin Welder.
  6. Activate Darksteel Citadel by tapping it, adding {C}.
  7. Repeat.

Combo 3 with Darksteel Citadel + Great Furnace

Results: Infinite colorless mana · Infinite landfall triggers · Infinite red mana
Show steps
  1. Activate Goblin Welder by tapping it, causing you to sacrifice Great Furnace and return Darksteel Citadel from your graveyard to the battlefield.
  2. Darksteel Citadel enters the battlefield, triggering Retreat to Coralhelm, untapping Goblin Welder.
  3. Activate Darksteel Citadel by tapping it, adding {C}.
  4. Activate Goblin Welder by tapping it, causing you to sacrifice Darksteel Citadel and return Great Furnace from your graveyard to the battlefield.
  5. Great Furnace enters the battlefield, triggering Retreat to Coralhelm, untapping Goblin Welder.
  6. Activate Great Furnace by tapping it, adding {R}.
  7. Repeat.

Combo 4 with Ancient Den + Great Furnace

Results: Infinite landfall triggers · Infinite red mana · Infinite white mana
Show steps
  1. Activate Goblin Welder by tapping it, causing you to sacrifice Great Furnace and return Ancient Den from your graveyard to the battlefield.
  2. Ancient Den enters the battlefield, triggering Retreat to Coralhelm, untapping Goblin Welder.
  3. Activate Ancient Den by tapping it, adding {W}.
  4. Activate Goblin Welder by tapping it, causing you to sacrifice Ancient Den and return Great Furnace from your graveyard to the battlefield.
  5. Great Furnace enters the battlefield, triggering Retreat to Coralhelm, untapping Goblin Welder.
  6. Activate Great Furnace by tapping it, adding {R}.
  7. Repeat.

Combo 5 with Seat of the Synod + Ancient Den

Results: Infinite blue mana · Infinite landfall triggers · Infinite white mana
Show steps
  1. Activate Goblin Welder by tapping it, causing you to sacrifice Ancient Den and return Seat of the Synod from your graveyard to the battlefield.
  2. Seat of the Synod enters the battlefield, triggering Retreat to Coralhelm, untapping Goblin Welder.
  3. Activate Seat of the Synod by tapping it, adding {U}.
  4. Activate Goblin Welder by tapping it, causing you to sacrifice Seat of the Synod and return Ancient Den from your graveyard to the battlefield.
  5. Ancient Den enters the battlefield, triggering Retreat to Coralhelm, untapping Goblin Welder.
  6. Activate Ancient Den by tapping it, adding {W}.
  7. Repeat.

Combo 6 with Darksteel Citadel + Ancient Den

Results: Infinite colorless mana · Infinite landfall triggers · Infinite white mana
Show steps
  1. Activate Goblin Welder by tapping it, causing you to sacrifice Ancient Den and return Darksteel Citadel from your graveyard to the battlefield.
  2. Darksteel Citadel enters the battlefield, triggering Retreat to Coralhelm, untapping Goblin Welder.
  3. Activate Darksteel Citadel by tapping it, adding {C}.
  4. Activate Goblin Welder by tapping it, causing you to sacrifice Darksteel Citadel and return Ancient Den from your graveyard to the battlefield.
  5. Ancient Den enters the battlefield, triggering Retreat to Coralhelm, untapping Goblin Welder.
  6. Activate Ancient Den by tapping it, adding {W}.
  7. Repeat.

Combo 7 with Ashaya, Soul of the Wild

Results: Infinite death triggers · Infinite ETB · Infinite landfall triggers · Infinite LTB · Infinite sacrifice triggers
Show steps
  1. Activate Goblin Welder by tapping it, sacrificing any artifact creature you control and returning any other artifact creature from your graveyard to the battlefield.
  2. The creature enters the battlefield as a Forest land, triggering Retreat to Coralhelm, untapping Goblin Welder.
  3. Repeat.
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