Nobody, Forgotten Nightmare

Changeling

{2}{u}: Exile Nobody, then return it to the battlefield at the beginning of the next end step.

You may have Nobody enter as a copy of target aura or nonland permanent in a graveyard or on the battlefield, except it has Nobody's other abilities.

If Nobody doesn't enter as a copy, it's power and toughness are equal to the number of permanents in all graveyards.