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
But as time went on, we realized that people like cascade, and we understand it, so why not just do more of that
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
Magical Hacker Magical Hacker is somewhat like an exaggerated version of Contagion Claspa card thats mainly used because of its interactions with other cards, mainly planeswalkers
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
The core problem here was that the Goblin player wanted Goblins, but no one else did