The deck is so rigidly built around these mechanics that it feels hard to identify just one or two big upgrades to improve its power, and instead, you would need to chop and change a considerable chunk of the deck to make meaningful improvements
So, based on that you know our Colossus friend here comes from the Ninth Edition core set (the symbol), and that he's a rare card (the gold color).More information about cards can be found in our giant-yet-easily-searchable card database Gatherer
Agatha of the Vile Cauldron Biomancer's Familiar Bladegraft Aspirant Blossoming Tortoise Convergence of Dominion Embalmer's Tools Forensic Gadgeteer Heartstone Lavinia of the Tenth Mutagen Man, Living Ooze Power Artifact Sam, Loyal Attendant The Dining Car Training Grounds Zirda, the Dawnwaker
The same sorting logic carries over to other collectibles, so if you also handle sports cards, the workflow in our guide on how to sell sports cards on eBay maps almost one-to-one
Want to get real janky