A card I thought of a while ago:

Sorcery
Destroy all permanents.
During your first turn of the game you may play Brutal Reversal without paying its mana cost.
Probably not good enough to see competitive play, but could be funny in some situations. Opponent opens with Workshop, Mox, Lodestone. You open with land, Brutal Reversal. Also, I think this could be fun in EDH.