The Last Scream of Nicol Bolas

(You may cast a legendary instant only if you control
a legendary creature or planeswalker.)
Split second
Cast this spell only if you have exactly 1 life and
if an opponent have more than 10 life.
Flip a coin. If you win the flip, you win the game.
If you lose the flip, you lose the game. If you play
this card other than your hand, you lose the game.