I'm working on making a deck for every color combo and for UR, the (fairly difficult) choice was Melek. He's interesting, unique, and izzety.
This deck is built to use as many instants/sorceries as possible, and lots of ways to manipulate your topdeck so you can keep gas on top of your deck and lands hitting the field. Cards like repel and griptide should kill people's tempo, until you can assemble a wincon. Wins should mostly come out of nowhere, insurrection-style, with theft, burn, and tons of instants and sorceries being flung around, etc.
I did buy jtms for the deck, remains to be seen if it's worth buying capture for. Besides jace and some lands it's pretty cheap, which is cool.
I gotta be honest, this deck looks like a blast. I'm excited to try it out.