general targeting effects could hit one at random like effects that hit minions or one generals effects could always target the same general, only changing when that general is dead. that is if the generals have separate health. on a different note, what about abilities that buff generals like sunforge lancer. does it buff the general who owns it or both? can overload be cast on your allies general? i think it would be a good idea if earth sphere became a targeted spell in this format.
what really needs to be figured out is whether teammates will share units and turns simultaneously or whether they will alternate and keep things seperate (at least until one dies). should teammates be able to see each others hands? should they share decks when one dies? when one dies, do they keep playing? can you put artifacts on your ally, even if only after you’re dead?
personally i think that each side should use one faction since balancing multi-faction combos would be nearly impossible. though im conflicted since that would take half the fun out of it.
there should also be an improvement to in game chat since navigating menus to talk to your teammate would take too much time to strategize. with 2v2 they should increase the turn timer from 90 seconds to 120 seconds to let teammates discuss their turns.