Well, here is why: his Pok-Power, Regi-Move, lets you discard two cards, which you will want to be Pokmon, and then your opponent has to switch their active Pokmon with a benched Pokmon if it is a Basic
You can execute that whole infinite mana loop and then exile all your opponents nonland permanents using Preston's activated ability
Youve got the Dwarfs, they need Snow White
Desecrate Reality takes colorless removal up a notch, granting multiple targets and potentially even some reanimation for your seven mana
You can remove two cards from your graveyard (probably setting you back below threshold) to make a single player discard a single card of their choice, at sorcery speed
You can target your opponents leader or one of their rested characters