Smaug the Impenetrable + Metalwork Colossus + Goblin Bombardment + Tippy-Toe, Terrific Partner

Smaug the Impenetrable

Metalwork Colossus

Goblin Bombardment

Tippy-Toe, Terrific Partner

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 Tippy-Toe.
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 loop turns the indomitable dragon Smaug the Impenetrable into a self-sustaining forge of destruction, pinged repeatedly by Goblin Bombardment to generate a torrent of artifacts. Thanks to Tippy-Toe, Terrific Partner, every instance of damage to Smaug yields extra tokens to keep the engine fueled, while Metalwork Colossus provides the recurring sacrifice fodder because its massive mana value allows it to be recast for zero mana. You can simply sacrifice the Colossus to Goblin Bombardment to deal that crucial point of damage, use the generated artifacts to bounce the Colossus back to your hand, and repeat the cycle indefinitely for an overwhelming cascade of triggers.