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Is open the graves a wise choise when you only run 16 creatures, maybe play an extra Liliana?You might consider Bontu or maybe Midnight Reaper.This is a list of my Mono Black Zombies deck that I played att my LGS during standard showdown.https://www.mtgvault.com/cyanic/decks/standard-mono-black-zombies-2/
I am not so sure Thing in the Ice is a good choice either.When you have it on the battlefield with one of the other creatures, you basically can not pump your prowess creatures since the Thing will flip and force a bounce.Thing is much better in a control typ of game.maybe: Abbot of Keral KeepJace, Vryn's Prodigy: so you can get your spells back for even more prowess triggersSoul-Scar MageBloodwater Entity: you might be able to test from Hour of devastation