I have been playing smaller versions of this deck with no nymphs for quite a while now. It's actually two possible decks: Gravity with mark of Entropy, or Entropy with mark of Gravity. I personally like mark of Gravity if you aren't using nymphs, but if you have access to a few Gravity Nymphs, go ahead and make Gravity your main element. I try to keep it down to 30 cards, but against the false gods you could go a little bigger and would need at least one or two nymphs of both elements.