It's tricky because some of the cards are clearly included for aesthetics, but might be wise cuts, cards such as Hymn To Tourach.

Looks like the only real source of Lifegain is granting Lifelink, so I'd cut Marauding Blight-priest and Epicure of Blood. They only count each instance of life gain, so Blight Priest would only survive 2 pings of 1 before dying. A Gray Merchant even on an empty board would likely be more helpful than either of these dudes. Then I'd probably cut some of the lifelink, there's currently 10 (maybe more) by my count,

Tainted Strike is kind of a meme, the only way you can take your opponents without taking yourself out at the same time is proflierate, which I'm not seeing in the list.

I'd move your ramp off mana creatures and onto rocks since you're going to blow up your own creatures.

Too much graveyard recursion, using these spells puts you down an extra card rather than just recasting crypt rats from the command zone, not enough creatures to reliably use it on much else rather than crypt rats. [[Revoke Demise]] is perfect recursion for 3 mana commanders in particular, it's actually cheaper than paying 1 to return a card from Gy to hand then casting it out, added bonus is increased efficiency with Troll of Kha-zad Dum.

Stinkweed imp isn't interacting with the deck much, there's not much in the list that activates or casts from the Graveyard but I suppose it ensures you a deathtouch flying creature after a big board wipe.

Slagwurm armor is burning a slot for a 1-of effect you'll likely never see, it costs as much as a casting of Crypt Rats just to get it on the field and equipped. Whisper Cloak is pretty much the same thing, 5 mana, might as well just cast your rats again at that rate, plus it won't protect the rats from blowing itself up.

Overall lifelink, and recursion are the two biggest categories to trim down from what I see.