How pushed do you want your deck to be? If you don't mind leaning into the Commander a bit you could easily use Captain Sisay, the ceiling is tutoring up Thrumming Stone I guess, but finding other Legendary stuff is also very useful, offering you a tool box to solve problems or a win con once you've gotten set up.

I also think Jetmir would be pretty bonkers, and Red gives you stuff like Impact Tremors and Purphoros, God of the Forge, these are great back up win cons if you can't win via attacking for some reason.

FWIW if you have Brainstorm and/or Ponder then the ability to shuffle your deck on command can be pretty impressive. The classic example is when you Brainstorm and find a bunch some better cards, put the two worst cards from your hand on top and then use a fetch land to shuffle your deck so you might draw more good cards instead of those situationally bad cards. If you're on Blue (and already use both Brainstorm and Ponder) then it's common to run as many fetch lands as possible, many decks will run 12 or more for a 2 or 3 colour list, with a smattering of duals and a Basic of each type they need (Blood Moon exists).

If you're already on Cranial Plating I feel like you should use Vault Skirge, the two play together fairly well, even a single swing can give you enough time to take over. Not quite sure what you'd cut for them though!

Who knows if it's entirely 'good' in here, but Raised by Giants isn't an aura and it gives Wolverine +8/+8, too bad it doesn't come with Trample! There is also Belt of Giant Strength that might synergize for a handy buff.

Maybe One with the Kami? It doesn't have to go on Wolverine, and if he's strong enough you a ton of bodies. The card can go infinite with many other cards fwiw, but I've rarely seen it used for that so it shouldn't attract attention.

While it might not look fantastic at first glance, Kessig Wolf Run is a pretty useful card in most Gruul lists that feature ramp, and in this list it's even better since your Commander can regenerate if the opponent kills him due to low toughness. Since it's a land it's a safer include IMHO. Shinka, the Bloodsoaked Keep is a much fancier land, but First Strike seems like it'd be a nice ability to have. Final one, the new Arena of Glory, Haste is a sweet ability.

Inquisitor's Flail is a card I always look at when I build a Voltron list, if it's at all possible to be sneaky with it it's a very cheap damage doubling equipment that stacks with almost everything. Just this and and your Commander hits for 8 without any counters, and you can just regenerate him if he dies, but it's even better with double strike, then you'd hit for 16 from just those 2 things, and having even +1 power would turn it into 24, which is lethal.

As for possible cuts:

I don't love Assault Strobe, I hate that it's a Sorcery, especially when even Temur Battle Rage exists, giving double strike without trample seems like a bad idea. BTW I'm not saying run Battle Rage necessarily, I don't know if you want a one and done like this, and you for sure don't want it to be a Sorcery IMHO.

Animist's Might makes me wonder if Monstrous Onslaught is better, it doesn't have to target your own creature so it's harder to disrupt, and the ability to spread the damage out can make things very ugly for people if have a big creature. Might to me looks like it'd be cheaper to cast, but you'll only ever kill one creature with it. Similarly I don't love Contest of Claws, Sorcery speed removal isn't very good and I'm not sure that's enough upside (though it is better than Might fwiw, I'd look at better cards). If you're dead set on a card like this why not use Stump Stomp  ^Flip instead? At least it's a land if you're desperate.

Grumgully the Generous seems bad? I could be missing something, but a single +1 counter doesn't sound like it's worth a slot, especially at 3 mana, and you can only get it on ETB, so it's VERY timing sensitive; do you REALLY want to delay Wolverine a turn for this guy? I love the flavor of the card so I could see it being a pet card, so if it's a favorite keep it! Similarly I don't know about Renata, Called to the Hunt, both of these are great if you've got synergies with the counters, but if you don't they are just a one time +1/+1, and if they come down late they might just do nothing at all.

Concord With the Kami looks like a bit of a trap to me, if you are getting wiped a lot the card will do nothing, right, and that's when you want it the most!

How often do you find yourself drawing more than 3 cards with Season of Growth? I think Harmonize is going to play more consistently fwiw, but if you find you're usually drawing 3 or more cards with Season it's probably fine.

Do you really need to size of the effect for Signature Slam? It seems worse than Kamahl's Will, which costs only one more for an (arguably) much bigger effect. These lands are Indestructible and have Vigilance, so they can all safely swing (and can benefit from buffs as creatures for that turn) if you need that, but they can also work as handy blockers, I feel like killing the opponent's best creature AND making a bunch of blockers is nice upside?

I don't think you want or need stuff like Arcane Signet or Gruul Signet in Gruul, you're already vulnerable to stuff like Bane of Progress, so why increase that vulnerability? There are still Green ramp spells out there fwiw, including Three Visits. I guess the rocks are cheaper (and can add Green when you're truly desperate), but it seems more like an allowance to run more Basics (in a deck that doesn't run anything like Primal Order or Blood Moon), do you have some good payoffs for running Basics over the odd dual? I get the price point, but I feel like when you go much over $100 you have to start spending more on lands, or really lean into some kind of synergy with Basics, such as the ability to dig out a TON of Basics somehow (there are cards like Traverse the Outlands I guess).

I hope some of these ideas help, apologies if I suggested you cut any pet cards!

I mean you could maybe do the idea using Sisay, Weatherlight Captain? Or I dunno, use Hare Apparent and Captain Sisay? Too many rabbits is pretty unpleasant too!