The Astral Express

Crew 8
Legendary Crew 4
When The Astral Express becomes a creature,
untap each legendary creature that crewed it.
They each get +4/+4 until end of turn.
When The Astral Express attacks, exile cards
from the top of your library until you exile a
nonland Legendary card. You may cast that
card without paying its mana cost. Put all
cards exiled this way to the bottom of your
library in a random order.