Karn's Final Sacrifice

Legendary (You must control a Legendary Creature or Planeswalker to cast this spell)
Choose a creature type. For every player that controls a creature of that type, they exile
all but the bottom card of their library.
———{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}
"He truly was my favorite robot." -Urza, at
the celebration of Domanaria