Incubation Orb

When Incubation Orb enters the battlefield look
at the top X cards of your library for a creature
with a converted mana cost of X or less and exile
it, then put the rest of the cards on the bottom of
your library in any order. Whenever Incubation
Orb is destroyed you may cast the exiled creature without paying its mana cost
{4}{t}: Sacrifice Incubation Orb, draw a card