While Jace might be banned from Standard, he's not banned from playing in Standard, so the vacationing planeswalker was allowed to play
Deck Comparison If you compare both Commander decks directly, Draconic Rage is clearly the more aggressive deck at first glance, offering many card combinations to increase your own damage and inflict it actively or passively
Any choices made when the spell resolves won't have been made yet when it's copied
Warp exiles cards, and void cares about things being exiled
His fast card draw, combined with powerful red staple cards and a base 6,000 power makes this leader tough to deal with, even forcing Bandai to issue a restriction list to balance the deck
Im guessing the best play is to just wait it out and then scoop