Rius, Lost Titan of The Abyss

When Rius, Lost Titan of The Abyss enters the battlefield, call forth three creatures from The
Abyss (search your library, starting from the bottom.
They must be a Kraken, Leviathan, or an Octopus.)
Put these creatures onto the battlefield without
paying their mana cost, then shuffle your library.
"Man hopes to never know the nightmare monsters
that inhabit the caves and cliffs of the ocean floor."