I'd just like to intrude on this topic and say that I really like the concept. In fact, the only thing I don't like about this is the art, and I even like that a little. (the parrot in the top left corner makes it for me).
I'm not really seeing the special synergy with Dune scorp, but its definitely cool to have Nightmare (even better when you think you are giving them life cards) and Silence, cards that don't get that much use outside the very specific situations.
And just something, might just be me, but does the +3 +3 work like Nightfall (affects even creatures played afterwards) or just cards on the field when it is played.
(Oh, and multiples of this, would they stack +3, +6 then all be destroyed at once by one chaos power?)