It doesnt say you HAVE to counter with another power specifically. I countered with a person Panther wouldnt attack.
I don't know what part of this thread you don't understand. The powers of one character are supposed to be geared towards the weaknesses of the previous character. Thats the whole point of this thread.
Here's a smaple chain for you: Venom-Banshee-Dazzler-Dr.Light-Invisible Woman-Shadowcat-etc. etc.
Anyways Deadman is the person to be countered since Magneto cant effect him in ghost form.