Diana still needs a sustain buff
Perhaps a small Heal on her W. Maybe a 2% HP refund every time she procs all 3 orbs. Riot always said they liked Diana as a fighter more than burst.
before i get "diana is too op" comments from people getting crushed by dianas, she isn't. Sje'll still be a poor pick until riot decide whether she;s a fighter or a burst. Before her buffs, she was an underpowered burst. now she's a fighter who can't build off-tank simply because it clashes with her kit.