Yvold, wyldwood jötnar

Prophesy {2}{g}{g} (If you look at this card with a
scry ability while it's within your library you may
immediately play it for its prophesy cost.)
All cards in your library that do not have
Prophesy have Prophesy. The cost of this
Prophesy ability is their mana cost plus {2}.
You may look at the top card of your library at
any time, and you may play that card for its
Prophesy cost.