Mages are abusing Courage of the Colossus
As the description says, Courage of the Colossus is meant for Colossus, meaning true tanks. Mages aren't supposed to (ab)use this mastery, nor it is intended. In order to balance this out without hurting tanks, I suggest this mastery has limited range of usage (200 units would be ok imo). That way mages couldn't proc it from far away, needing to fully commit (melee range) in order to for proc to happen.
P.S. I would maybe restrict this to class only, however Riot is unlikely to do that.
. I've never seen a game where mages have so much access to health instead of being glass canons.
What mages are getting a benefit out of this, compared to sacrificing thunderlords/dft, and offensive stats?
will probably pick up the mastery for the rest of the season as long as it isnt trashed.
who i killed some 6 times and then couldn't duel at all while she just AFK pushed lanes

take it and get a big ass shield from E when surrounded.
rip.