Permanent-based CC like Owl's Eye or Eternity is difficult to stop since death has no PC and entropy has no good PC, but your devour/parasite problems may be alleviated with such gems as Chaos Seed. Plague is too slow for my liking.
You do not need a mark and seven Entropy sources to power your cats. At the very least, switch to Death Mark, since you only have four
quanta sources to power half your deck.
Boneyard seems to not be useful. The deck is hindered by any damage-reduction shield while Skeletons crowd your field. I see potential with Pandemonium to rack up a huge Bone Wall, but you need your Cats.
The deck takes a long time to set up, so Discord might be a good choice to stall in the early game.