Mydracil the Forgotten

When Mydracil the Forgotten enters the battlefield, exile all other creatures. Mydracil the Forgotten's power and toughness are equal to the number of creatures exiled this way.
His story lost in time, Mydracil is an eternal mystery
from a bygone age. Some call him a god, while others proclaim him a warrior of the long-lost Tyurne empire.
His is mission unknown, his motives are unfathomable,
but one thing is certain; wherever he goes, death seems
to be just behind.