The Ark, Menagerie Courier

When The Ark enters the battlefield, create three
Spoils tokens. (They're artifacts with "{t}, Sacrifice
this artifact: Target creature you control gets +1/+1
until end of turn.")
Whenever The Ark attacks, search your library for
a creature card with mana value X where X is the
number of different powers among creatures you
control, put it onto the battlefield, then shuffle.
Crew 3