Avatar State

At the start of your upkeep, you can give all avatar creatures you control vigilance until end of turn and +1/+1 for every other avatar creature you control until end of turn. If you do, those creatures get "If this creature would be destroyed this turn, exile it instead," until end of turn.

"The Avatar State is a defense mechanism designed to empower you with the skills and knowledge of all the past avatars. The glow is the combination of all your past lives, focusing their energy through your body