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Here's a story all about how, I got bored of playing Magic right now. So I made this deck to combat my friend, and I know this deck isn't one that he will commend. My friend spent $150 on one deck, and he doesn't use any other. It's an Elvish Piper/Eldrazi deck which has no strategy other than being a complete asshole. It's become very boring to play with him, since I have a whole bunch of decks. So, I've scrounged together a deck so annoying to play against that he'll WISH he never made that deck! MUHAHAHAHA!
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I'm of the mindset that you might be a little short on land. Cabal Coffers are amazing and all, but too many can be devastating in the early game. Further, there really isn't much in the deck that really requires you to run them. You can go two directions to remedy this: shave the Coffers down to 2, or shave the count down to 3 and add in Urborg, Tomb of Yawgmoth to help prevent early issues. Once that is accomplished, consider Exsaguinate, Consume Spirit, or Drain Life. They'll serve as AMAZING kill conditions with the Coffers while giving you something to really abuse the Coffers on. You might also consider running the route of Edicts in place of the Doom Blades and Throats. While they don't allow targetting, they will address what you need them to when you need it. They also are not effected by Indesctructible issues (should that be a concern). Lastly, and this is just preference, consider replacing Bargain with Necropotence. While Bargain gets you the cards immediately (which is better than Necropotence), Necro hits the board ridiculously faster (which is why it's better than Bargain). While you are running the Rituals to help speed the cause for Bargain, they will also accelerate Necro (even faster) so that you never have card issues and always have advantage. Further, having Drains to support either WILL guarantee your success rate ten-fold. To see what I mean, take a look at my mono-Black build. It's remarkably similar to yours with some slightly significant changes (http://www.mtgvault.com/ViewDeck.aspx?DeckID=345027). I, too, used to run Lilliana (her ability works remarkably well with Necro/Bargain), but I found that I was using her for the same thing(s) every game and was able to replace her with Demonic and Vampiric Tutors. This allowed me to run a deck that has nothing exceed a 4CC, and ultimately control every element of the game until lethal damage. Take a look at it, you won't be disappointed and I really believe that you might be able to pull some ideas to help make your friend adjust his playstyle. Thanks!
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Why no, thank you! Never have I had the pleasure of someone with so much helpful advice! There is so much helpful advice, I think I'll take much of it to heart. Necropotence is one of them. I do have a few Necropotence's, but never have played them because I always seem to make mono-black resurrection decks, and Necropotence is poison to it. So my mindset has always never catalogued Necropotence as a great spell so some reason. The Edict's (and Verdict) are another thing that I will definitely use. Again, I've been playing in Modern for a while, and again, my mindset has completely forgotten the Edict's. I also have a lot of Doom Blade's floating around my house. Another thing I need to do is to put Obliterator in this deck. Again, have 1, never found a use for it. The one problem is that my tutor's (Demonic and Vampiric) are in my EDH deck :(. I'll just put them in here for the sake of it, but I don't actually have them in this deck. Again, thanks a lot!
Glad to hear these ideas will work for you! In a casual format, in my area. My Black Hole deck is my go to deck in the casual format and it rarely lets me down. I hope it brings as much frustration to your friend(s) as I know it brings mine.