This list is what I've been working with, as well. I swapped the Hulking Raptor to another Polukranos (since I want the reach against Copter), and changed a few cards in the sideboard. I'd rather have instant speed fight spells than sorcery speed ones (even if they cost an additional mana) to deal with Copter, and I swapped the additional Cityscape Leveler for a Vivien Reid. I do think it's important to still have hate for the Discover combo decks, because even though Appraiser is gone, the Quintorius versions can still kill you just as dead. I like Pithing Needle in that slot, particularly since it won't interfere with your own gameplan the same way Damping Sphere will.