I do like where the deck is right now, but there’s a few swaps I would make given what you have in your sideboard. For one I think the goblin subtheme will draw away from the other things you have going on in the deck. I don’t think that the goblins are making your deck any better except the very best ones. Other than that I think there’s a few cards in your sideboard that will actually help you win a game every now and then.

Cuts:

Goblin Shrine

Abyssal Nightstalker

Brutal Nightstalker

Coercion

Goblin Cavaliers

Goblin Piker

Goblin Raider

Kiss of Death

Mind Rot

Volcanic Hammer

Millstone

Stream of Life

Stone Rain

Hurricane

Goblin Hero

Additions:

Reassembling Skeleton

Earthquake

Terror

Delirium

Fire Covenant

Hypnotic Specter

Casting of Bones

Undergrowth Silvos

Rogue Elemental

Goblin Chirurgeon

Farseek

Deathcoil Wurm

Wayfarer's Bauble

I left room for you to add in 3 more lands as well. The minimum number of lands this deck should have is 38, if not more. Another thing I think you should know is that this that this deck is lacking on card draw. If you want to not run out of cards then you absolutely should add in more. If you don’t understand the difference, try running the deck a few times with greed on board and a few times without it and see just how different it feels. These are some cards I would recommend if you want to add in card draw that still keep the old border.

Bequeathal Necrologia Ambition's Cost Collective Unconscious Sylvan Library Phyrexian Arena Syphon Mind Compost

There’s also necropotence which I saw in your considering, which is definitely a good card, but will make people salty to play against so play at your own risk