NAUTILUS, Limits Broken

Menace, Absorb 1
When I transform, return all Fish, Kraken, Leviathan, Octopus, Serpent, Shark and Squid creatures of mana value 4+ from your graveyard
to your library and shuffle.
Fish, Kraken, Leviathan, Octopus, Serpent,
Shark and Squid creatures in your hand cost {4} less to cast.