Scyuhtlicue's Summons

As an additional cost to cast this spell, target
opponent may reveal the top ten cards of their
library. You may have them put any number of
those cards into their graveyard.
Reveal the top twenty cards of your library minus
the amount of cards revealed by your opponent.
You may put any number of Kracken, Merfolk, Squids, and Octopuses into the battlefield. Exile Scyuhtlicue's Summons.