Soul Prison

Exile {x} target creatures/Plainswalkers. Soul
Prison enters the battlefield with loyalty counter
equal to the number of Plainswalkers exiled with
it.
{3} until the end of turn Soul Prison gains all card types, abilities and power and toughness of target
card exiled with it. You may activate this ability
only once per turn.
When Soul Preson is destroyed return all cards
exiled with it to their owners hands