Mouldering Wish

You may choose a permanent card you own from outside the game with converted mana cost X or
less, where X is the number of creature cards in
your graveyard. If you do, reveal it and put it
into your graveyard, then you may return a
permanent card from your graveyard to your
hand. Exile Mouldering Wish.
When you look beneath the earth, no one can predict
what you might find.