Smaug the Impenetrable + Metalwork Colossus + Blasting Station + Doubling Season

Smaug the Impenetrable

Metalwork Colossus

Blasting Station

Doubling Season

How it works

1. Activate Blasting Station by tapping it and sacrificing Metalwork Colossus, dealing 1 damage to Smaug.
2. Smaug triggers, creating two artifact tokens due to Doubling Season.
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. When Metalwork Colossus enters, Blasting Station triggers, untapping Blasting Station.
6. Repeat.

This clever engine turns Smaug the Impenetrable into an infinite token generator by using Blasting Station to deal the noncombat damage required to trigger his ability. Doubling Season ensures that each instance of damage yields double the Treasures, which fuels Metalwork Colossus's ability to recur itself directly from the graveyard. Because Metalwork Colossus costs zero mana to recast thanks to the high mana value of the artifacts you control, its entry triggers Blasting Station to untap, allowing you to seamlessly repeat the entire sacrifice-and-loop sequence.