Final Bet

Hexproof
If you were to lose this turn and Final Bet is in
your hand, you can't lose until next upkeep and
you may cast Final Bet from your hand without
paying its mana cost.
When Final Bet enters the battlefield you gain
10 life. Opponents have 3 turns to make you
lose the game. If they fail to win, you win the
game instead. Creatures you control can't attack
during these 3 turns.