In other games, when someone has an ult or full meter, their lifebar or something glows. I think just having maybe the name or reticle on the target glow or on fire when the target has LB would be good for all forms of PvP. Nothing to create visual noise; just subtle. Think purify could also have a persistent graphic, rather than having the eyes scan the buff bar. For all the flaws of Heroes of the Storm, I liked how, when someone cannot be hit with CC, their name becomes "UNSTOPPABLE" momentarily.