Smaug the Impenetrable + Metalwork Colossus + Jolene, the Plunder Queen + Goblin Bombardment

Smaug the Impenetrable

Metalwork Colossus

Jolene, the Plunder Queen

Goblin Bombardment

How it works

1. Activate Goblin Bombardment by sacrificing Metalwork Colossus, dealing 1 damage to Smaug.
2. Smaug triggers, creating two artifact tokens due to Jolene.
3. Activate Metalwork Colossus by sacrificing the two artifact tokens, returning Metalwork Colossus from your graveyard to your hand.
4. Cast Metalwork Colossus by paying 0.
5. Repeat.

This clever loop turns the durability of Smaug the Impenetrable and the sacrifice outlet of Goblin Bombardment into an infinite engine, fueled entirely by the clever artifact synergies of Metalwork Colossus and Jolene, the Plunder Queen. When Goblin Bombardment pings Smaug for 1 noncombat damage, Smaug's triggered ability tries to make one Treasure, but Jolene's replacement effect steps in to double that output into two Treasures. Those very same tokens help reduce the cost of Metalwork Colossus to zero, allowing you to cast it for free after returning it from your graveyard by sacrificing the two freshly minted Treasures. Because Metalwork Colossus costs nothing to replay, you can continuously sacrifice it to Goblin Bombardment to repeat the cycle, yielding infinite artifact and creature triggers alike.