Interesting... I fought one for the first time yesterday and damn what a beast. It was a doubles game, and thing took 3 turns of fire from two wave serpents, a wraithknight, a tooled up unit of long fangs, regular space marine squad, a lascannon razorback before finally dying. Not looking forward to facing on again but your trick might work especially combined with some psychic shenanigans as well.
_________________
Checkout my Project- Lions of Asuryan:Eldar Corsairs http://www.thedarkcity.net/t5288-lions-of-asuryan-craftworld-eldar-updates