Darkest Bargain

cast only if you are a virgin
give your firstborn child to Mark Rosewater
you cannot lose the game and your opponents can't win the game, you may cast spells without paying their mana costs, you may play spells from your library, graveyard, exile, or any other zone added in the future, you may choose to include additional costs (kicker, overload, etc) in the unpaid costs of spells you cast. these effects persist for the rest of your life, they remain in effect in all of your future
games of Magic: th