The House "Usually" Wins

Improvise (Your artifacts can help cast this spell.
Each artifact you tap after you're done activating
mana abilities pays for {1}.)
Flip X coins. While flipping, if you lose five or
more flips, you lose the game. Then for each flip
you won, draw a card. For each flip you lost,
discard a card. If you won three or more flips,
take an additional turn after this one. If you won
five or more flips, you win the game.