Ra's Al Ghul

Legendary Villain creatures you control get +X/+X,
where X is the number of legendary creatures you
control.
Whenever you cast a legendary Villain spell from
your hand, exile cards from the top of your library
until you exile a legendary Villain nonland card with
lesser mana value. You may cast that card without
paying its mana cost. Put the rest on the bottom of
your library in a random order.
"I have been called criminal and genius... and I am neither! I am an artist!"