https://mtg.cardsrealm.com/en-us/tools/commander-power-level-calculator
Score: 5

Got a fancy Double Masters Brainstorm, swapped it for Opt

Another no brainer, why counter "non-creature" when you can counter anything.
Arcane Denial for Negate

Counterspell for Dovin's Veto

As I drew some sample hands for this deck, I realized it had no chance of winning a 3+ player game. The only way it could was mass concession because everyone was annoyed with all the card draw. I liked the idea of making my opponents creatures work for me (Impetuses, Fight to the Death), so I wanted to expand on that and add control for other resources too. Also, seemed like way too many lands. What's better than a possible repeat way to get extra turns? Not much.

Mass Manipulation for 1 Island

Council's Judgment for Celestial Purge

Gisela, Blade of Goldnight for Sunblade Angel

Drain Power for Thrill of Possibility

Stitch in Time for Winged Words

Entrancing Melody for Celestial Colonnade

Sower of Temptation for Ornithopter

Dack's Duplicate for Anticipate

I Sideboarded Fists of Flame due to the amount of card draw in this deck. Cure for the Common Game notes that Commander damage is the likely route to win with this deck, so Vadrok needs a lot of pump. 7 rounds at 3/3 is a lot with 3 opponents. If you're playing in a group without a lot of graveyard tactics I would suggest substituting for Tormod's Crypt.

Also

Castle Embereth for 1 Mountain

Original source decklist by Cure for the Common Game YouTube Channel:
https://archidekt.com/decks/574305#Deck_#567_-_Vadrok,_Apex_of_Thunder

Some major overhauls ensued. As always, I try to work with cards I have as much as possible. One thing I noticed right away was how many tap lands (13!) and mana rocks (9!) were in this deck. Way too much for my comfort.

Land replacements as follows:

Hallowed Fountain for Azorius Guildgate

Fabled Passage for Evolving Wilds

Temple of Epiphany for Izzet Guildgate

Temple of Enlightenment for Meandering River

Sacred Foundry for 1 Mountain

Steam Vents for Rupture Spire

Glacial Fortress for Sejiri Refuge

Clifftop Retreat for Stone Quarry

Celestial Colonnade for Tranquil Cover

Reflecting Pool for Transguild Promenade

Temple of Triumph for Wind-Scarred Crag

Cascade Bluffs for Spectral Searchlight

I swapped Azorius Signet for Azorius Locket to try to maintain some ramp at 2.

Teferi, Time Raveler for Chain of Vapor, I did not have Chain of Vapor and it is relatively expensive. I had Teferi, and he does not have the drawback of your opponent possibly using the same ability by sac'ing a land, plus that static ability is just a b!tch.

Mythos of Vadrok for Commander's Sphere, for flavor! Too bad it is not repeatable with Vadrok.

Boros Charm for Flawless Manuever, I kept my one copy of FM in the Ruthless Regiment based deck, it is expensive, and Boros Charm is not a bad sub, flexible due to the options, and is still repeatable with Vadrok.

See the Truth for Frantic Search, I had it, I don't like tossing cards, unfortunately lose the untap lands piece.

Healer's Hawk for Suntail Hawk, because why wouldn't you want a lifelink flyer for 1 instead of just a flyer.

Lightening Bolt for Incinerate, because I had one and not the other.

Blitz of the Thunder-Raptor for Jeskai Banner, for flavor! There is so much card draw in this deck, I really didn't think I'd need to pay 3 for it.

Unbreakable Formation for Raugrin Crystal, protecting mutate stacks is pretty important, repeatable with Vadrok.

Oketra the True for Ugin's Conjurant, I had the sweet Amonkhet Invocations version, so it is nice to be able to fit it in a deck. Truly indestructible, double strike, just need to maintain a party of four.

Sea-Dasher Octopus for Tormenting Voice, the comic art variant is just so nice, plus flash mutate onto Vadrok allows for potential shenanigans bringing things back on other people's turn.

Since I had the Godzilla art for every card that had it in the original decklist, I used it. To fit the last one in:

Pollywog Symbiote for 1 Island