Elandria, Mystic of Celtanis

Flying, Hexproof
Elandria, Mystic of Celtanis is not a creature
unless you have cast an instant or sorcery this
turn.
Whenever an instant or sorcery is cast you may
search your library for a card and exile that card,
then if you have cast an instant or sorcery you
may put that exiled card 7 cards from the top
of your library.