TheDevicer - Banned in the french format my friends enjoy. Otherwise, I'd be all over that.

SturWulf - Toxic Deluge is the end-all go to. Black Sun's Zenith, Mutilate, Profane Command, Drana, Kalastria Bloodchief, and Karn Liberated are the costlier ways. Tragic Slip requires something to be killed, but it tends to go morbid most of the time. Occasionally Sudden Spoiling + a Horobi enabling card or Liliana of the dark realm's -3 ability.

Usually my biggest concern involves shroud/hexproof. If Arcane Lighthouse isn't out, it hoses my strategy pretty quick.

Oh okay. I would think Horobi wouldn't be on the field for more than one turn though, so how do you keep her there for long?

SturWulf - It depends on who I play against, but you're correct. I usually get 1-2 turns before someone does something about it. Horobi is a bomb that drops and wipes out creatures when need be.

I usually have a permanent with the ability to target set up before playing Horobi due to her frailty.

That being said, a large portion of my play group's target spells are removal already so I can usually milk a few more turns if I don't abuse the ability right off the bat.

This is real cool, I wish I could run this deck! Currently out of my price range though. I can think of some cool cards to go with Horobi but not in the right colours...

Izzetdimir - There's plenty of hope if you want to run a Horobi EDH setup. The original deck was $6; the updated version was a whopping $50. What you see currently is a slow accumulation of expensive cards that have merged with the core concept, forming a hybrid between the original idea and a MBC goodstuff deck.

Hex Parasite, Staff of Nin, Touch of Darkness, Liquimetal Coating, Sacred Armory. Squee's Toy, Drana, Kalastria Bloodchief, Kuro, Pitlord, Retribution of the Ancients, Unspeakable Symbol, etc - All of these are less than a dollar, most less than 50 cents. That's 10% of my deck right there, all of which plays directly off of Horobi. If your group isn't too cutthroat you can get away with a lot of jank; for example, here is a gatherer search for a ton of black cards with activated targeting abilities. You could easily build a deck by using a ton of these cards and then cutting from there. At the very least, that's how my deck started.

More or less, don't let a low budget stop you from playing with fun generals!

Great deck! seems very interactive.

Very interesting deck. I've never seen a commander built around him before, but super trolling is fun!

If you can get ahold of one, Vampiric Tutor over Diabolic Tutor.

If you're looking for more cruel control kind of stuff, you could consider Bottomless Pit or Oppression.

I also am not sure about you playing so many board wipes. Essentially, since you already have this built into your commander, you may end up wiping only one or two creatures (including your own).

It's kind of a bad card, but also hilarious if you want to go this route: Descent into Madness

Curious if you're still running this because I myself am contemplating making a version similar to yours. I'm just wondering how long does Horobi typically stay in play or is he usually gone before the next turn?

Some suggestions I have seen from other builds:

Glaring Spotlight for those pesky hexproof critters. It can also allow your critters to be saved from being targeted.

Scuttlemutt acts as a mana rock or tap: murder.

Black Market take advantage of all the death.

Bloodchief Ascension

Blood Artist/Falkenrath Noble

Painful Quandary on theme with the hand disruption

Flagellum - Hey friend, I'm still running this deck as well as actively tweaking it. The list on my computer is far more french-oriented due to the warping of my meta, so I've decided to stop updating this listing of it. Anyway, to answer your question on how long Horobi can last: it highly varies.

Expect it to only last a turn, at most; recursion is king for Horobi. In some cases, Horobi has lasted a few turns or more! This is usually due to the only cards with a 'target creature' clause in an opponent's deck already being removal, which is usually viewed as a waste to be used on an otherwise 4/4 flying beater.

Anyway, as far as the cards you brought up:

Arcane Lighthouse >>> Glaring Spotlight, but that's just my opinion. I'd use the space for Expedition Map or something of the sort. Glaring Spotlight was pretty much a requirement before commander 2014, though!

Scuttlemutt - Slow to work, but functional. I wasn't a fan of it, but it certain has a place in this deck as a killing drone.

Black Market - Never got a chance to play this card with my current list (which has taken a bit of curve hit due to almost exclusive 1v1 frenchy matches, but that's not listed here). From what I've seen, it's busted in multiplayer games.

Bloodchief Ascension - Just another black goodstuff kinda card. It doesn't do anything to make or break a Horobi deck, but I'd run Mindcrank with it so you can at least have the infinite combo.

Blood Artist effects are heavily reliant on the opponent having plenty of creatures to play. I'm not sold on it for my deck, but that's because my meta has a lower creature count than most (I wonder why, haha).

Painful Quandry - It's pretty much a sweet card in any black deck. I haven't ran it in other decks, but it's a solid edition if you intend to play more into the hand-crippling area of monoblack.

That's where I'm torn between; running more hand disruption or more control/stax. I almost exclusively run multiplayer so things like Duress are great 1v1 but you want to hit everyone.

Have you thought of running cards such as Lightning Greaves to protect your creatures while Horobi is off board, so they remain safe when he returns? Mikaeus, the Unhallowed can give your creatures protection from Horobi, though he shifts the focus from Horobi to himself

An awesome prank card is Endless Whispers which lets you pass Horobi to other players. Sure having a 4/4 flier is handy, but Horobi's effect is why you picked him, not his stats and flight

Pit Spawn is a Monster.

I use the black ninjas in my Horobi. Ninjutsu is a great way to get Death's Wail off the field when the effect is less beneficial for you. Each of the abilities lend themselves to your overall strategy. Ink-Eyes, Servant of Oni Okiba-Gang Shinobi Throat Slitter Skullsnatcher.

Nim Deathmantle is an all-star in a deck like this.