Diluvian primordial, spells with x

[Mike_garzone]

 {Diluvian Primordial} comes into play. I search my opponents graveyard and find an entreat the Angels. How would the x in its mana cost be treated? Or would I not be able to cast it?

[Keyeto]

Whenever you cast a card without paying its mana cost, any value of X is treated as 0. You may cast it, but it wouldn't do much!

RESOLVED

[Mike_garzone]

Ah .poo. lol I passed on it in the grave because I was not sure of the legality of the move. But your explanation made the most sense. Thanks!