I have at least eight, though I'm sure there are more if I take the time to sort them out, complete playsets(4 of each card) of Ravnica: City of Guilds COMMONS (just the commons, no uncommons or rares.) for anyone keeping score, that's 440 cards.

I'm getting back into magic after a while of not playing, so i'd be particularly interested in anything playable in standard or extended, but anything I don't already have several thousand of would interest me. If you have any questions, feel free to ask!