When Ghalta enters the battlefield, it, Cadric and Cloudstone Curio trigger.
Resolve the Cloudstone Curio trigger, returning Dockside Extortionist to your hand if its on the battlefield, or returning nothing to your hand otherwise.
Resolve the Ghalta trigger, putting Dockside Extortionist onto the battlefield from your hand.
When Dockside Extortionist enters the battlefield, it and Cloudstone Curio trigger.
Resolve the Dockside Extortionist trigger, creating at least one Treasure artifact token.
Activate a Treasure by tapping and sacrificing it, adding 1.
Resolve the Cloudstone Curio trigger, returning Ghalta to your hand from the battlefield.
Resolve the Cadric trigger from step 2, causing you to pay 1 to create a token copy of Ghalta with haste.
When the Ghalta token enters the battlefield, it and Cloudstone Curio trigger.
Resolve the Cloudstone Curio trigger, returning nothing to your hand from the battlefield.
Resolve the Ghalta token's trigger, putting Ghalta onto the battlefield from your hand.
Repeat from step 2.
If opponents control at least two artifacts and/or enchantments, this combo nets infinite Treasure tokens and colored mana.
This brilliant loop uses Ghalta, Stampede Tyrant's massive entrance to dump Dockside Extortionist into play, immediately refunding your investment through treasures if your opponents have enough artifacts and enchantments in play. As Ghalta enters and re-enters, Cloudstone Curio bounces the goblin back to your hand while Cadric, Soul Kindler lovingly bypasses the legend rule to duplicate Ghalta over and over again without sending her to the graveyard. The resulting cascade of creature and artifact triggers completely breaks the board wide open, cycling Ghalta through your hand to continuously fuel the engine.