So for one, I get the whole fear of rotation bit, but there are a few cards you can pick up from the RTR block that would REALLY up the power of this deck.
I know, but the extra rule makes for a nice chalange aswell
As for cards in Theros and such that would make sense... Eidolon of Countless Battles. It's far better than Ordeal of Heliod in here.
I'll defenetly consider putting that one in