Lots and lots of arrows (my 3k list runs 2 blocks of 20 archers, 7 chariots, and 7 horsemen, meaning a well placed smiting bubble can generate 82 arrows in a single shooting phase). Casket is also good, or killing blow to the face off of Tomb Guard (cursed blades being cast if I think I need to rely on killing blow). Other than that, avoidance is a good strategy... if I'm going to get stuck in combat with it, then I'm likely to feed it a tarpit of skeletons and chuck the 5+ ward incantation...did this this afternoon against Wood Elves... 40ish Tomb Guard, or whatever was left after a fight with Treekin, overran and got flank charged by Orion and Dryads. Dumped protection on them, and when we had to pack up 3 rounds of combat later there were still 20-odd left, and my king was near his gunline flaunting his death mask, letting the casket go nuts.
Necropolis Knights are also a reasonable bet, and chariots if you can get them into a flank, deal damage with impact hits, and break them on the charge.