Maelstrom Hydra

When Maelstrom Hydra enters the battlefield, cascade X times. (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less.
You may cast it without paying its mana cost.
Put the exiled cards on the bottom of your library
in a random order.)
Maelstrom Hydra enters the battlefield with
X +1/+1 counters on it.