If you're dead-set on building a five-color deck of your own, there are a couple of legends that could serve as a good starting point
Clear, well-lit photos, following eBay image requirements, that showcase the actual condition of your card are what will build trust with potential customers
The core problem here was that the Goblin player wanted Goblins, but no one else did
If that doesnt work, try Putting It All Together to stop a big bad character in their tracks and survive to quest again next turn
If it lives to your next upkeep it allows you to put any creature from a graveyard into play under your control as a Phyrexian
But as time went on, we realized that people like cascade, and we understand it, so why not just do more of that