Imagine this exiling a counterspell.

If the spell cast that way remains in exile; it would be horrible, but I don't think that was the intent?

It's sure an interesting wheel of fortune variant. Kind of swapping hands but not really.

...oh my gawsh. This in multiplayer. The river would be ridiculous!

I was specifically thinking about multiplayer where a card can just sit there accessible to multiple players and everyone can see all the answer cards and reset buttons floating around.

@Vitenka, yeah I didn't know about that/how to word it in so that the spells cast work normally.

Multiplayer was the main intent, though it could exist fine in two-player too I think.

This is basically a riff on Share the Spoils

The spells cast normally and go to the graveyard unless you specify otherwise, so that's fine. The bigger issue is priority fights, where it's confusing about who can cast instants

Yeah, you can see the subclause on Share the Spoils that makes all the difference.

Yeah, only being allowed to do it during your turn, and once a turn, is a sensible safety valve there.

But why would you want a safety valve? Cast this. Watch as everything goes crazy and everyone tries to cast all of the instants at once :)

The active player (usually the player who cast this spell, since it is a sorcery) normally has the first priority, and then the priority will be in the order of the other players.

(In a game using the shared team turns option, your entire team gets to decide; if your team cannot come to an agreement, the rightmost player must make this decision.)

The spell cast in this way won't remain in exile because casting any will be move into the stack instead.