Tenjo, Harbinger of the Skies

{t}: Add one {u} to your mana pool.
{6}{u}{b}{b}{r}, {t} Each player is dealt X damage, where X is the number of Cloud and Mist creatures on the battlefield.
As the skies conjure bigger gusts, Tenjo Remains unperturbed. "This." He says, "Is the way of the sky."