The Vault of Glass

Indestructible, hexproof
{3}{b}{b}{b},{t}: Take an extra turn after this one.
Any player may activate this ability. During extra turns, you cannot play sorceries. If Atheon,
Time's Conflux is not on the battlefield under
your control, you must pay half of your life,
rounded up instead.
Pay 10 life, {t}, Exile The Vault of Glass: Exile
three permanents.