Scylla, Master of Messina

This spell cant be countered.
{10}{t}, Exile Scylla:You lose 40 life,
then you win the game. This ability can't be countered.
Scylla guarded the Straight of Messina, with much success, due to her seven heads. She destroyed anyone
who tried to pass mercilessly. So the fate has been for
all who believe they are capable of killing the monster.