6
Is there already a format that does what I want?
(lemmy.world)
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The closest thing I can think of is Canadian Highlander, but it doesn't tick the last item on your list and it only is cheap if you proxy.
That's kind of what I feared. Although I guess in this case, a "bring whatever you got" would wind up being just zero point canlander decks, so maybe that's fine. This is meant to be fairly casual anyway.
Honestly, that sounds like a great way to get into it.