So just to confirm this thing is basically a big 'cancel absolutely everything on the stack ever' card?
Should do. I'm guessing this can still be countered itself.
Sure it can be countered.
I think it's highly unlikely we get this, though, because of the game design.
"How many times would you like to activate that?"
"oh, just one. for now." figure out mana selection for just one shot of whatever you're using.
... watch the timer go down. Ability resolves.
timer starts again for the phase. pause it. activate ability again. dialog to ask how many times. watch the timer start for responses again.
repeat. repeat.
Not that I'm saying the developers won't be up to the task, but I'm saying they're trying to make this version of the game play very snappy. This card does not do that in an online game.
Actually, with the auto-resolve option, the programmers may not be up to the task. That's a lot of strange interactions you could get.
I don't think you understand how the card works. It resolves once, and that's it. It exiles everything that is on the stack at the time you cast it. And you don't get to pick and choose, either.
What this does is counter uncounterable stuff, counter abilities including on-cast abilities, and counter multiple spells/abilities in those fringe cases where the opponent puts multiple spells/abilities on the stack instead of resolving them one after the other.