Activate Cold Storage's first ability twice by paying {6}, exiling Restoration Gearsmith and Dockside Extortionist from the battlefield.
Activate Cold Storage by sacrificing it, returning Dockside Extortionist and Restoration Gearsmith from exile to the battlefield.
When Dockside Extortionist and Restoration Gearsmith enters the battlefield, they trigger.
Resolve the Dockside Extortionist trigger, creating at least ten Treasure artifact tokens.
Resolve the Restoration Gearsmith trigger, returning Cold Storage from your graveyard to your hand.
Activate ten Treasures by tapping and sacrificing them, adding {10}.
Cast Cold Storage by paying {4}.
Repeat.
If opponents control eleven or more artifacts and/or enchantments, this combo nets infinite Treasure tokens and colored mana.

Infinite blinking

Infinite colored mana

Infinite ETB

Infinite LTB

Combos with "Restoration Gearsmith"