Which comic book character has a Necklace with the "Eye of Agamotto"?

Dr. Strange has always been a favorite of mine. Even before Benedict Cumberbatch brought him to life.

As a kid, I always liked Dr. Strange. I didn't see him as a humorous person until Benedict Cumberbatch portraid him in the movies. Cumberbatch's performance really brought out the lighter side of this character. I loved it! Plus my name is Steve also. That sealed the bargain!