Gus Porter, Young Illusionist

{1}{u/r}, {t}: Draw from your library until you reveal
a creature with mana cost X or less, where X is
the number of total creatures you control. You
may cast this creature without playing its mana
cost, but it is an Illusion along with its other card
types, and its power and toughness are 1/1.
When an Illusion leaves the battlefield, you may
cast a creature from your hand the same way
without paying for the ability cost.