Two comments I can see coming are why no
midnight banshee/
cauldron of souls? I don;t run
banshee because quite often I'm against decks that have some or a lot of black creatures and we actually run enough non-black creatures to the point where she just hurts us more than the enemies. I don't have cauldron purely because giving things persist is a lot worse for this deck than undying, with undying we just strip the counter, with persist we have very few ways of stripping the -1/-1 counters also the counters often times just kill our infect stuff so it's redundant