If you're looking for cards to take out the Devil's Play and Red Sun's Zenith can be taken out. With only 20 lands and no other mana sources or ramp you won't be able to produce a lot of mana for those X spells.
Yah I have been debating on removing both Devil's Play and Red Sun's Zenith . I put them in solely to give the deck the chance to destroy enemy creatures but I don't know what I want to put in instead. I was thinking going for good low drop spells like maybe Lightning Bolt or maybe switching in some of the Journey to Nowhere that are in the sideboard?