Naya Pod, G/R Tron, and white life gain decks all have a 55/45 to 60/40 edge vs jund.
I don't think there are too many good cards vs jund. Tectonic Edge comes to mind. Path to exile + Snapcaster Mage can give jund some problems. Wurmcoil engine also gives jund problems. In jund mirrors, blightning was a key card. Anything that's a 2 for 1 that you can get out by turn 3 is decent against jund.