Crucible for making some plays. Cost isn't that bad considering the active is 2 summoner spells in one but shorter CD than either of them.
It's barely shorter than Cleanse (210s), though quite a bit shorter than Heal (300s). Then again, Heal is also better due to AoE (though no scaling) and there's the inherent delay of using Crucible on a target of a hard CC as opposed to them Cleansing themselves. Which, personally, I find to be the worst part of Crucible: The whole user delay is about half the hard CC duration anyway.
I dunno. Crucible feels too weak right now. Or, I guess, Locket feels too good in comparison? Something like that. I wouldn't be against Crucible buffs!
Tried AD Thresh on PBE. If have 1.00 ASPD, it's a 20% AD steroid overall at max level Range is too tiny to make it any viable. Buuuut since Riot doesn't want you to play champs in a way they didnt design (AP Lulu, AP Rengar, Tank Rengar) I'm guessing they'll nerf Q to remove AD scaling but make it scale much stronger with souls.
Tank Rengar design issue was more how absurdly good it was. Considering that he's still played similarly, I'd not really chalk it up the same as AP Lulu and AP Rengar (which was a terrible build anyway).
That said, Bruiser Thresh is fun. His short range is irrelevant there and he can bully basically all the melees. His slow wave clear makes it hard to push the lane but it also means he gets forced to sit under tower and just farm with his Q Passive. On top of that, being under tower means he can drag people into tower range for free kills. Hitting late game with him means 4-5k+ Health with a good amount of base AP and Armor as well. It's pretty fun.
Plus, it means I get to play Thresh AND top lane!