I understand why you're playing with black, but can you tell me why you're playing red over white? White gives you enchantment removal, and an incredible artifact hoser in Kataki. Further, making black the primary color allows you to play other cards like withered wretch, which is an incredible gy hoser, Hymn/Cabal Therapy and Dark Ritual.
I really don't think I'm seeing red's merits in this deck. Sure it allows you to remove artifacts, but white lets you do that also, and with more versatility. It gives you great hate cards against control, a la REB, but do you really need this in the prescence of men and graveyard hate?
I have found more luck in Planar Void because Tormod's Crypt is just one hit and then your opponent can use their G/Y from then on, but Planar Void just continues to RFG. Yes, it costs one mana more, but as long as i get it on the board i dont think that it is going to make a difference whethere or not i was able to drop a Grim Lavamacer or a Goblin Vandal. What i am saying is, if they are going to wreck me right away, then does it matter whether or not i have an untapped swamp on the board, if not a 1/1 goblin?
You're missing the point here. The fact of the matter is, Void is relatively ineffective against Dragon because they can Discard Dragon via bazaar and then in response necromancy it at instant speed. See, Void forces the Dragon player to simply find a necromancy. Crypt forces them to find both another animate, but a Dragon as well.
Besides, the only deck that the hate is really necessary with is Oath
Which brings me to the logical extension of my last paragraph: How is your Dragon matchup?