Deformed Hydra

When you cast Deformed Hydra, reveal the top
X cards of your library. You may exile any creature cards from among them. Then shuffle the rest into your library. Deformed Hydra enters the battlefield with as many +1/+1 counters on it as the total converted mana cost of all cards exiled this way.
{b}{g}{u}, {t}: Deformed Hydra fights target creature. If that creature dies this turn, put as many +1/+1 counters on Deformed Hydra as that creature's converted mana cost.