Goblin Welder + Retreat to Coralhelm + Darksteel Citadel + Great Furnace

Prerequisites

• Goblin Welder does not have summoning sickness.

Steps

1. 1Activate Goblin Welder by tapping it, causing you to sacrifice Great Furnace and return Darksteel Citadel from your graveyard to the battlefield.
2. 2Darksteel Citadel enters the battlefield, triggering Retreat to Coralhelm, untapping Goblin Welder.
3. 3Activate Darksteel Citadel by tapping it, adding .
4. 4Activate Goblin Welder by tapping it, causing you to sacrifice Darksteel Citadel and return Great Furnace from your graveyard to the battlefield.
5. 5Great Furnace enters the battlefield, triggering Retreat to Coralhelm, untapping Goblin Welder.
6. 6Activate Great Furnace by tapping it, adding .
7. 7Repeat.

Effects

• Infinite colorless mana
• Infinite landfall triggers
• Infinite red mana