Maktaraka, Mother of All

{x}{g}, {t}: Reveal cards from the top of your
library until you reveal a non-land card with
mana value X or less. You may cast that card
from exile until the end of your turn without
paying its mana cost. If it is a creature, it has
haste, double strike, and trample until end of
turn. If it is a non-creature spell, copy it. Put
the rest of the cards at the bottom of your
library in a random order.