keeping with the theme, a decent support card would be Tangle
well first off, if you are running mono black, I highly recommend that you use Cabal Coffers.
Some Black cards that really shine in Multiplayer :...
some good BLUE multiplayer cards :
Blatant Thievery (the more players in game the more powerful this card gets)
Bribery ( 5 mana to play an...
I'd consider using Vedalken Shackles and Flow of Ideas .
Hello, just came across your site, thought I'd drop in and say Hi.
I'll add a link to your site from my mtgo clan site....
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