Throw in the existing issue of many players being uncomfortable with Universes Beyond being part of Standard, to begin with, and theres potential for a mass exodus out of the format come June
By that, I mean mulligan any hands that are sketchy and have a chance of not working out
Focus on corrupting each opponent first, get some extra cards from your commander, and then decide how youre going to achieve a poison kill
Plus, Tegan Jovanka can pump The Seventh Doctor on attack
Each of your opponents loses three lives for each one mana youve paid into X unless they sacrifice a nonland permanent or discard a card
The cards that it exiles can't be seen if it leaves play, but if you use them before it goes (or they are worthless), who cares