Darksteel Citadel + Goblin Welder + Retreat to Coralhelm + Seat of the Synod

UR identity

Commander legal

The 4 combo pieces

What must be in place

Goblin Welder does not have summoning sickness.

How to execute it

  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.

What the combo produces