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It's not perfect, but I've done somewhat well with it (I'm playing lower tier games on Untap.in, so think FMN level competition.)
I think that the Izzet could get a storm like ability, such as "Whenever you cast your 3rd spell this turn, x, y, and z."
Maybe the Azorius will have an ability that allows creatures to blink themselves for a cost? Or one that lets them trigger their ETB effects again?
Rath (Elves)
Serra's Realm (Enchantments/ Angels)
Zhalfir
Thran-ruled Dominaria or Mirrodin before Memnarch messed it up (Artifacts)