Phyrexia's Triumph

Improvise
Any player may pay {x} to counter this spell. No
other methods may counter this spell.
You win the game.
"The oil has spread across the land. There's nothing
left but you, Yawgmoth. There's nothing left for you to conquer. Tell me: was it worth it? Was it worth it to
finish your crusade, now that there's no more to do?"