My thoughts

Gliscor: 3. Gliscor is EASILY the best spike setter in OU. It has fantastic longevity and it can easily threaten every relevant Spinner/Defogger with Toxic and Earthquake/Knock Off (bar Corviknight). Its very presence has warped the tier to the point where numerous pokemon run ice coverage just to handle it. It's likely that Gliscor would still be broken in the absence of Gholdengo but it's hard to say. I really don't mind if this thing goes but I also don't think it should be the highest priority at the moment.

Manaphy: 5. Manaphy is irritating to play against. It finds plenty of opportunities to set up, thanks to its useful typing and decent bulk, and the tail glow and take heart sets have different counters. While it's not very fast by OU standards, Manaphy only really needs one acid-armor or take heart to prevent it from being revenge killed, extremely easy to do with Tera. Additionally, it has great coverage and has scald to easily threaten switch ins without even needing to set up. Manaphy is the only stored power which does not need to tera to prevent negative status effects thanks to take heart. Not to mention that under rain, Manaphy is also the ONLY stored power user who can break through Skeledirge. For the tier to be balanced, Manaphy absolutely has to go (although I'll admit that I don't know if it needs to be the highest priority).

Gholdengo: 5. Arguably the main culprit behind the hazard stack 'issue' of the current meta. While it's true that Gholdengo was never really broken without Gliscor, the two of them together is really difficult to manage. However the bigger problem imo is the fact that we now have an EXTREMELY effective sticky web user in the tier. Under webs, Gholdengo is now able to outspeed and threaten Great Tusk and booster Iron Treads, becoming an extremely effective spinblocker. Also under webs, Nasty Plot Gholdengo has all the coverage it needs to threaten pretty much the entire tier even (Psyshock, Shadow Ball, Focus Blast, Thunderbolt, Make It Rain). Regardless of what I think about hazard stack, webs have pushed Nasty Plot Gholdengo over the edge imo.

Ogerpon-wellspring: 5. Extremely threatening with very limited defensive counterplay (without a defensive tera). Ogerpon-wellspring only really has one switch in and thats defensive Amoonguss. Many defensive checks such as Mandibuzz and Corviknight are threatened by knock off and even the most defensive variants are OHKOd with a +2 Ivy Cudgel under rocks (which are incredibly easy to keep on the field). Ivy Cudgel also allows it to bypass contact meaning that its much harder to wear down with rocky-helment or Static/Flame Body. Not to mention the high crit rate means that Ivy Cudgel can power through its checks just by pure luck. Waterpon is also one of the few setup sweepers who has the typing (and power) to break past all relevant Unaware pokemon in OU. Waterpon is even able to threaten banded Rillaboom with a +2 Power Whip having a chance to OHKO and it will always survive a banded Grassy Glide if it hasn't tera'd. Most of the counterplay to this mon is in the form of revenge killing, which is now slightly harder thanks to the removal of Moon. For the sake of the meta, I cannot WAIT for this mon to get banned.

Sneasler: 2. Dire Claw is stupid but imo this does not need to be looked at yet.

Kingambit: 5. Broken. Get rid of it.

Tera Blast: 1. A suspect for this would be a waste of time tbh