It can be oppressed but not Rai-Oh'd.
The difference between this card and valley is that valley is on the field where as this card is played from the hand. Also, Valley leaves the field and this card comes to it, I expect Twilight decks to be packing it, maybe BW and Zombies too.
Not many cards can stop this : Oppression, Divine Wrath,... can't think of anything else that is commonly played that can stop this