The Great Armored One

Eminence — As long as The Great Armored One
is in the command zone or on the battlefield, if
you control a Crab, creatures you control in your
hand, library and graveyard are Crabs. The same
is true for Cephalids, Leviathans, Octopuses,
Serpents, Starfish, Homarids, Fish, Merfolk
and Krakens.
Crabs you control have Hexproof.