Vecna, Who Laughs at Mortals

Flying, Deathtouch, Hexproof, Indestructible
When Vecna, Who Laughs at Mortals enters the battlefield, pay life until you have 1 left. You may
take an extra turn after this one.
{x}: Counter target spell that costs X unless they
pay {p/u}{p/u}{p/b}{p/b}
{10}{t}, Sacrifice 15 permanents: Destroy all other permanents. They cannot be regenerated.