+2 Flaming Blade
Note that +2 Viper Strike Fang does not include druid and druid in the proofing doc is not very swordy. Can a monk wield two of these due to VSF precedent?
Arcane Belt
While "you cast" may be clearer, the parentheses aren't any clearer.
Lenses of Agility
If an eye slot UR exists that is just +4 DEX, that is a better token to own than Lenses of the Fae. It just is. Can come up with scenarios where you would run LotF instead - if +4 oddened your DEX *and* if 50% mattered significantly. Otherwise, just getting better.
I get some of why this got a massive power jump from when it was +2 DEX. Why would anyone at this point care about Lenses of the Fae, well, besides those who already have them and don't have infinite disposable income. Well, and anyone who sees the progression of tokens and starts thinking "Next will be a +4 DEX and +1 Saves [or +2 AC or whatever]", which, in isolation, isn't going to change behavior but as part of a general progression across tokens of better, better, better, might actually lead someone to just give up on caring about the new bauble.
That's with no other ability. For rogue players who weren't concerned with non-bows and non-xbows, this is a functional reprint with +4 DEX. I'm reaching that point quickly where I just don't see why I care about anything new besides TEs, but, then, there are all of these "new players" [who apparently are going to stock up on a bunch of URs] that will.
Btw, since the only tokens with "Agility" in the name are two rares, it would be appropriate for Lenses of Swift Sight or, apparently, the very first Cheetah token to exist.
Lucky
I'd also put the math being on the side of Lucky being better than older options. But, some of those old options are older than Redoubt, so the natural progression of everything getting better suggests these are okay.
Ring of the Drake
"to" could be replaced with "with" and there should be line space.
Semi-Lich Skull
I'm with Andrew that this isn't likely to impact Teeth sales much as is. Just being psychic is worth 4hp. Big dropoff in value for new Teeth was with 5th. So, I'm going to spend $40 or whatever depressed price there is for 6th and 7th Teeth just to go from 4hp to 7hp? To get some of the sketchy special abilities that come with 1, 2, or 3 Teeth? The relative value should be on having one more Tooth. But, whatever, changing this now seems pointless.
Ring of Wonder
So, let's see. Pros - Wonder is quite limited presently, not forcing players to use the neck slot makes all other neck slot items better [wait, is this actually a pro?], Amulet of Wonder is not a good UR and gets worse over time while we just gained an additional ring slot so it becomes vastly easier to justify being Wonder-ful. Cons - Doesn't this completely kill any reason to run Amulet of Wonder? AoW already required a massive sacrifice to run instead of other URs. So, I've never actually run AoW even though I own more than one. By moving to ring slot, seems that much less likely to get a power ability since ring was less of a sacrifice and, going forward for many, much less of a sacrifice. So, even if you owned AoW, you would be getting less value out of it. Of course, could do a trade-in!!!!
Look, expanding Wonder to more people is fine. Moving it out of neck has some benefits as forever locking it to neck will mean AoW will only get used when it's broken or TEing. But, ring devalues AoW far more than, say, the build diversity of Crown of Wonder or Eyes of Wonder or Belt of Wonder or whatever that isn't about to go to three slots.