Inundation Schoolmistress

{1}{u},{t}: Target creature gains the Blue color and
Merfolk type.
{u}{u},{t}: Return target creature to its owner's
hand.
Panoply (Apocalyptan) 4: (When the fourth
creature with this type of Panoply and a unique name
entersplay it triggers). Return all creatures to
their owners' hands except for Merfolk,
Krakens, Leviathans, Octopuses, and
Serpents.