Nix, Princess of Darkness

When Nix, Princess of Darkness enters the battlefield, choose a creature type. Nix becomes
that creature type in addition to her other
creature types.
Whenever you surveil you may choose a creature
that shares a creature type with Nix, Princess of Darkness. Nix becomes a copy of that creature
until end of turn, except her name is Nix,
Princess of Darkness, she is legendary in addition
to her other types and she has this ability.