Kiora, Sovereign of the Deep

Vigilance, ward {3}
Whenever you cast a Kraken, Leviathan,
Octopus, or Serpent spell from your hand,
look at the top X cards of your library, where
X is that spells mana value. You may cast a
spell with mana value less then X from among
them without paying its mana cost. Put the
rest on the bottom of your library in a random
order.