Smaug the Impenetrable + Metalwork Colossus + Goblin Bombardment + Exalted Sunborn

Smaug the Impenetrable

Metalwork Colossus

Goblin Bombardment

Exalted Sunborn

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 Exalted Sunborn.
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 lets you feed an endless cycle of devastation through Goblin Bombardment by pinging Smaug the Impenetrable, whose indestructible nature happily shrugs off the damage while triggering his ability. Thanks to Exalted Sunborn doubling any tokens you make, that single point of damage yields two precious Treasures instead of one. Those very same tokens provide the exact fuel needed to satisfy Metalwork Colossus's sacrifice cost, returning the colossal construct from your graveyard straight to your hand. From there, the massive reduction from your noncreature artifacts lets you recast Metalwork Colossus for free, keeping the chain rolling infinitely.