I really enjoy budget decks but at first look seems like some things won't work well in yours (of course this depends on what people play in your group). I'll tell you what I think and some things I would change, but of course this is your deck and you can do with it as you want. I'll just write my opinion.
You have only a few creatures for
Yahenni, Undying Partisan's second ability and
Altar's Reap for example. Consider adding
Festering Goblin,
Shambling Goblin and
Perilous Myr instead of some of the auras.
You could use a sweep or two.
Infest is a cheep one, and there's also
Drown in Sorrow if you can get it
With the commander's ability you should activate morbid preety easily, so cards like
Skirsdag High Priest,
Malicious Affliction or
Tragic Slip could be good additions. There's also
Wakedancer in the morbid section.
I'd take
Despise out, since for your deck is better to let them cast the creature and then kill it, than to discard it. And I'd personaly prefer instants over auras for the removal, so that you can pump Yahenni as surprise.
If you'r planning to kill lots of creatures
Blood Artist could do a great job.
Zulaport Cutthroat and
Pawn of Ulamog could be nice too, only they only work when your creatures die.
I hope any of these is useful to you.
Regards
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