Was it THE slivers deck? The one that got basically banned for being stupidly powerful?
It was based off of the one you could buy. But I put in a lot of the old ones. And I had Sliver Overlords and Sliver Queens in there. It could be really powerful, but the problem is it was a 5 color deck, so if you somehow got a bad shuffle you were screwed.
They key is to pick off everything as soon as someone puts it down. Slivers aren't powerful on their own, so you just have to be quick. I had a friend who had all old decks, like, all the cards had white boarders. And the thing about the older cards and older players is that those games go really quick, newer games always seem to be slow and drag out.