Amaurot

Amaurot enters the battlefield tapped.
{t}: Add {u}, {b}, or {r}.
{5}, {t}, Sacrifice Amaurot: Each player sacrifices
half their nonland permanents rounded down.
"Never was a city more magnificent. From the
humblest streets to the highest spires, she fairly
gleamed... Not that you would remember any of this."
-Emet-Selch