Moon's Shadow

If you own a card named Emrakul, the Promised
End that is in your graveyard or exiled, Moon's
Shadow gets +4/+4 and gains flying.
{t}, {x}: Return target Eldrazi creature card with
converted mana cost equal to X plus the number
of card types among cards in your graveyard from
your graveyard to the battlefield tapped.
Emrakul may have gone, but she left behind more
than a hole in our hearts.