It's been mentioned a few times before, so it's not terribly hidden, but Perilous Forays is far and away my favorite ramp card/sac outlet in the right deck.
Pretty much anything not reliant on the general has a good shot. Make sure you've got enough ramp and answer cards, which are sometimes overlooked in EDH in favor of splashier effects. Make sure quite a few of those answers are targeted kinds of things instead of sweepers, but keep them versatile/recurrable so they stay relevant in the MP games.
Blue could get tricky. The things you want to do with blue in a duel (heavier control) are not necessarily what you want in MP. You can't exert the same level of control over an entire table, and trying to do that is going to make you quite a few enemies. I'd probably do something with black and a sacrifice or recursion theme, but that could just be that I was playing Savra earlier.
I don't play 1v1, but there are definitely some very competitive mono-b decks floating around (Evergreen's Iname, Death Aspect is the one that comes to mind first).
I haven't played a whole lot on there, but I've only run into one player being rude, and they just left because they felt we weren't moving through turns fast enough.
I'm against the really extreme ones, but they can definitely be effective. I had a mono-B player resolve Dystopia against me on cockatrice the other day playing Agrus Kos, and it pretty much locked both myself and the Angus MacKenzie player out (in a 3-player game).
They're solid. Occasionally, you're going to be in a tight spot where giving out the tokens actually matters, but most of the time I feel like they're undercosted evasive (except troll) beaters and the tokens can be a benefit instead of a drawback.
I'd probably take phantasm or dragon over the others, though.
That's... impressive. I really don't know what to say. Congratulations.
I hope I never run into this (or anything remotely close to that level of complexity) in a game. I do think it's well outside the bounds of any combo people would get upset about though.
It is infinite mana; you sacrifice the Traitor, make one mana. Sacrifice the Graveborn token, make another mana. Spend one mana to return the Traitor to play. Net gain: one mana. Rinse and repeat.
My answer makes a lot more sense if you overlook that you're sacrificing two creatures. My bad.
It's a perfectably acceptable and amazingly fun general if built right. For example: Nether Traitor + Phyrexian Altar + Sek'Kuar is infinite mana.
I think that doesn't get you infinite mana, but infinite ETB/LTB triggers are also pretty sexy.
Sek'kuar should work fine. I haven't played with or against him, but he's got an interesting ability in strong colors, so that says about as much as you need to know.
Kos. Fun in a battle cry-styled deck and very, very under the radar.
Blue could get tricky. The things you want to do with blue in a duel (heavier control) are not necessarily what you want in MP. You can't exert the same level of control over an entire table, and trying to do that is going to make you quite a few enemies. I'd probably do something with black and a sacrifice or recursion theme, but that could just be that I was playing Savra earlier.
I'd probably take phantasm or dragon over the others, though.
I hope I never run into this (or anything remotely close to that level of complexity) in a game. I do think it's well outside the bounds of any combo people would get upset about though.
Though the vote almost goes to Stangg for uberdylan's twin token up there. That thing is pretty awesome.
My answer makes a lot more sense if you overlook that you're sacrificing two creatures. My bad.
I think that doesn't get you infinite mana, but infinite ETB/LTB triggers are also pretty sexy.
Sek'kuar should work fine. I haven't played with or against him, but he's got an interesting ability in strong colors, so that says about as much as you need to know.