Mirrodin And Five
I want to imagine a world with Myr Incubator. In an artifact-heavy deck with possibly seventy-five artifacts or so, you can use the Incubator, get seventy or so 1/1 dudes, and win in the first combat phase where these dudes can attack. Yes, it costs twelve mana – but unlike Mindslaver, this is a winning condition on its own. Add Anger or Fires of Yavimaya and you can swing that turn. This has a fairly high potential.