This (RC) is an Astral Plane. Astral Planes have the following rules.
・Grade is ignored when calling an <Astral Deity>.
・If the card on the Astral Plane is not an <Astral Deity>, put it into drop.
・The unit on the Astral Plane can attack from the back row, and performs drive checks. Cards revealed for those drive checks are put into soul instead of hand.
・At the end of your turn, put the unit on the Astral Plane on the bottom of your deck.