Princess Shirahoshi

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 spell's mana value. You may cast a
spell with mana value less than X from among
them without paying its mana cost. Put the
rest on the bottom of your library in a random
order.