Did the Shadow Trait really need a buff? We're honestly a bit disappointed by this change, which will certainly make the Shadow Inferno compositions stronger — whereas we feel they're already dominating most of our games.
Druids are already the best composition in the early game when you want to build a winning streak, but they become really weak after that, forcing to rotate toward another composition (except if you manage to hard roll into three-stars). The buff they just received will certainly help to ensure smoother rotations.
Lights are undoubtedly the worst trait of the current meta. Will this buff help them to rank up in tier lists? We're seriously doubting about that.
The Ocean trait nerf is certainly the one that makes the most sense, since the Thresh/Nautilus/Vladimir early-game combo is certainly too strong at the moment. That being said, the Ocean Mages composition won't be affected by this change — at all.