As the triggered ability resolves, first the next opponent in turn order chooses a creature they control, then each other opponent in turn order does the same knowing the choices made before them
Its not that Umezawas Jitte just wins the game on its own, rather, its because it provides its player with constant boons
Of the three, Leinore would be my commander of choice, though the others have some merit
(The planeswalkers will be foil when they appear in the foil packs.) Slot three is the promo slot
Cancelling Cologne is a very niche card that can aid you in getting rid of ridiculous abilities, such as VSTAR abilities like Arceuss, or perhaps something that is difficult to get around such as the newly released Miltalk that prevents Pokmon V from touching it
Dont think thats some revelation: they know it, too