So the ATC tournament came to an end last weekend and unsurprisingly, the top players played some combination of Tau and Eldar.

Now, I won't complain so much about the combination (even though in my mind it takes no strategy, no thought, and is cheap) but I want to know how to counter it. Every single player who played this combo pretty much leaf blowed their opponent off the table.

Thoughts on how to beat this alliance?