Anything that adds +1/+1 counters en masse could be useful as well
Deranged Assistant and Sea Scryer Creatures that are allowed to tap for unconditional mana are a true oddity in blue, and while colorless mana isnt amazing, Im happy there are any mana dorks to choose from at all
Between its insane loyalty boosts on its plus ability and the constant resource advantage it provides, Karn is an absolute nightmare even in Modern
There are even some Commander decks that will synergize well with PuPu UFO, such as The Wandering MinstrelThe Wandering Minstrel
Toss in Night of Souls' Betrayal, Kaervek, the Spiteful, or Ascendant Evincar and your opponents wont have a board
There is something about that crackling electric energy on the holo surface that just looks right