santiago

Griselbrand would be a great addition to this deck, with a dark ritual, crypt ghast, and a heartless summoning, you could have him as early as turn 3

You could try running nevermore in your sideboard instead and simply disallow them from casting it in the first place, and also boros reckoner is one of the best 3 drops in the set, though quite expensive, and helps with the actual burn as well

clones and evil twins are a good addition to this deck, not only does it allow you to win without infinite reflections, but you can also use it to copy things like thragtusk or their creatures to stay in the game, and evil twin is also removal.

One major flaw is traumatize, it is the only non standard legal card you have, take it out so you can run it at the average tourneys.
Also dynathy is right, you should run some control. One thing you could do if you were running something like murder is to build up zombies with alchemist, and once you have a good amount you can murder him and attack for game which is easier

maybe add in a trepanition blade?

you really don't need 22 mana for this deck, you only have 11 cards that are over 1 mana and nothing is higher than 3. You only need like 18-19 mana for this deck

I feel like pierce striders would work really well in this deck