Liliana, the Dream Blossom

{x}{r/g}{g/u}, {t}: Search your library for a card with
converted mana cost X or less, and exile it. Until
end of turn, you may cast that card without
paying its mana cost. If a land card is played this
way, put a +1/+1 counter on Liliana, the Dream
Blossom.
Whenever you cast a spell or activate an ability
with X in its cost, you may have X become equal
to Liliana, the Dream Blossom's power.