Add a format for the Upcoming Set of Cards

I’d like to propose an “upcoming” format where the list of cards allowed includes those in the next upcoming main set (or side sets too). This would allow us to test and experiment cards that are coming out soon.

For example, I’d like to playtest Kashtira, but I have to rely on the Mathmech bot which is a great practice dummy, but doesn’t always make optimal plays.

Thanks for the consideration!

You can play with upcoming cards in the casual queue