Kyle Rayner’s current issue is the rings of every color following him, telling him that he has been chosen. He went to Oa to talk to Ganthet to try and get some help, but what the Guardians did to him left him the last person you can count on to help. And the first person you can count on to come at you with a violent solution to asking for help. Well, the Guardians preparing to attack Kyle is enough to trigger all of the rings, which jump on his fingers.
He’s not really a rainbow, more of a gray, but I’m going to call him the “Everything Lantern” until someone gives me a better suggestion.