Up the Ante

Pay 3 life: Choose an opponent, then flip a
coin. If you win the flip, exile the top card of that player's library. You may play that card
for as long as it is exiled and you may spend
mana as though it were mana of any color to cast it. Any player may activate this ability
only any time they could cast a sorcery.
You know you'll lose, but can you resist?