I'm going to say it: bring D-weapons and fast, hard hitting, high volume of fire units. Jetbikes with scatlasers comes to mind. Also warp spiders are a must (altough after the latest draft faq, they are less OP)
With these you will pwn not only necrons, mind you, but also anybody else!
With these you will pwn not only necrons, mind you, but also anybody else!