It’s not just BH/Doom that makes the team either-- OR/Doom is a very good duo also (qcf+K to get behind them while calling Doom and push them into rocks works almost like strider)-- plus both Doom and BH need a battery, and OR is one of the best batteries in the game. This is a REALLY well put together team IMO 
i didn’t mean it as the team of bh/doom, i phrased it wrong, sorry.
what i meant was that you have blackheart / doom as assists… it’s similar to the team cable/bh/doom. cable has two great assists and the assists compliment each other. each having a great function and both creating nasty traps. OR + doom is like, massive chip + be cautious about air dashing and rushing. that team wont get rushed at all.
so all in all, what i meant is that when you have an assist combo like that, it makes for good team, plus teh two work together. like, santhrax, having storm with both drones and corridor, and sent/commando and commando/sent work awesome together, it’s a similar concept, just on a lesser scale.
i guess what i said sounded like, those two make the team, like magneto/roll/psylocke can still win just because of mag/psy