How about applying some good old RB variants to hearthstone? The one I've got in mind is simple: Your decks can't contain any cards with mana cost of 2. Anyone interested? If there are at least a few people on NA or EU, we could do a simple round robin tournament. 8+ people on the same server and we switch to something that scales better.
I'm in on NA.
(Why no 2s? Because it totally changes the metagame. Aggro decks get slower, but a bunch of key cards in other decks go away too: Blade Flurry, Wild Growth, Sunfury Protector, Fiery War Axe... so everyone has to figure out what the good decks are from scratch, and then you figure out a deck that's good against those decks. )
I'm in on NA.
(Why no 2s? Because it totally changes the metagame. Aggro decks get slower, but a bunch of key cards in other decks go away too: Blade Flurry, Wild Growth, Sunfury Protector, Fiery War Axe... so everyone has to figure out what the good decks are from scratch, and then you figure out a deck that's good against those decks. )