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I just played one, with maindecked Mind Rot s, Ravenous Rat s and at least one maindecked Duress and it actually worked really well. He made me discard an Essence Drain , Servant of Nefarox and Nefarox, Overlord of Grixis and that completely turned the tide in a way that playing creatures on his own side wouldn't have done. I beat him the next game but it was exceptionally close and the final game he got stuck on 2 lands which is generally an auto-loss, so I'm not counting it.

Has anyone else seen a viable discard deck in limited lately? 

I played that deck. I've actually played two versions. One was straight black, another was black/blue. I think the mono-black one was more effective. I sided in a Jadymae Tome and won the next two games.

I wouldn't bet on it in M13. Ravenous Rats is far from what I'd call good discard. in some Cubes it can be possible though. Might be a thing once Return to Ravnica fills up with Dimir stuff from Gatecrash and Sinker though, playing Shrieking Affliction , Mind Rot , and splashing red for Skull Rend . What I really want though is graveyard synergy from Dimir and Simic (unlikely) so that I can make a wonky Chronic Flooding deck.

a discard deck 3-0'd an 8 man pod at FNM, RtR.