Gonna treat this like I did the Janna issue: Do something about gold gen items
Either bring the other two closer to coin or push coin back down to the other two. You KNOW something's wrong when SONA of all champs has a 10% Diamond play rate (last time it got that high was when she had like a 60% win rate). Now, of course I'm all happy and smiles for mah home girl Sona, but unfortunately, Sona's place in this game is akin to a bar of sorts: When SHE'S out of line, something bigger is out of line.
This all started when coin's busted gold gen started getting abused by Consensual Clown 1 (as far as Sona players go, anyway), and yet Riot nerfs the mana regen and not the gold gen. Do something to even out the gold gen between items or we're not gonna see the end of this until Riot guts every old-school enchanter in bot lane.