I use Extraplanar Lens in a couple of my mono-colored EDH decks too. But switch your swamps to snow-covered swamps if you can. That way your opponents don't get the bonus unless they're playing snow-covered swamps to, which they rarely ever are. It works that way because the lens says "lands with the same name"... keyword name.
Thanks for the suggestion; what's funny is that a bunch of us at my local shop were talking about doing exactly that last week. I think if I can find some foil ones cheaply, I'll do it.