The best way to limit the damage it does is with cover saves. Tyrands can easily give their important creatures a 3+ Cover Save at least, and only the roll of a 6 on thee destroyer chart ignores cover. Use this to your advantage if he is using the Wraith Cannons.
If he is using the Sword, know that he can easily kill any of your TMC without breaking a sweat. I may be wrong on this, but would the Dimachaeron stand a chance? Of course, the Wraithknight has more movement, but assuming it got the charge it gets 7 Str 8 attacks which cause instant death on 4's at Ws 8 I6. It's be a rought one, but it seems possible to down a Wraithknight before it swings.
But the option you'll usually here is drown it in Gaunts. They are cheap and fearless and even with stomp he won't take out more then 9 a turn. Clog him up while your Flyrants do all the work as they mow through the Scat Bikers which Flyrants excell at killing.
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