I'd probably build this a Dimir (Blue/Black) or Esper (Blue, Blach, White) control deck with a focus on proliferation
With a lineup of Electric and Dragon-type Pokmon, stunning new Tera Pokmon ex, and the return of ACE SPEC cards, Surging Sparks delivers excitement in every pack
They're coming to me with their childhood collections, and most of the time it's a mixture of new stuff and old stuff
It also cycles to achieve the effect, which is a lot harder to counter than a spell
UB can play off the same strong commons and uncommons as UR does, and it has some great expensive spells to pair them with like Sephiroth's Intervention, Ice Magic, Dreams of Laguna (flashback), and Sidequest: Hunt the Mark