Humpty Dumpty's Fall

When Humpty Dumpty's Fall enters the battlefield, create five 0/1 white Shell creature
tokens.
If you control a Knight or a Legendary creature,
you pay pay {w}. If you do, create a 5/7 white
Noble creature token named Humpty Dumpty
with "When this creature attacks, create a 2/2
white Knight creature token with Vigilance."
Exile all Shells you control.