So, then, I'll be the first to use this thread for what it's intended:
Mitosis. I can't think of a Mitosis deck that will beat the GotP/Rewind/Nightmare/Pest deck I've got up right now (Yeah, I got lucky and spun up an Obsidian Pillar!). It's 47-7, Rank 9 at the moment (though that tends to fluctuate really quickly; it was rank 21 an hour ago and rank 5 two hours before that). The AI plays it well, and I just can't figure a way to make Mitosis nastier than 12 Pests + 12 Rewinds + GotP+Nightmare.
Ideas?