Mardu Hero decks were a joy to play, and though their time in the sun was gone in a blink of an eye, the card itself was very memorable
My advice is to just play with things
Keeping in line with one of Prospers abilities but also expanding to a more widespread archetype for Rakdos, we have treasures
Theres a sort of stacking feature here where digi-volving allows you to combine effects from different cards (mutate in MTG, anyone?), so theres a lot of customization available during gameplay, too
The more you play Nexomon, the more you can tell how much the developer loves Game Freak games, but I'd go as far as to argue that some mechanics are better than the inspiration
Unless youre a big gambler, this forces you to go through the entire submission in store and see all of your grades in front of strangers