Overview

This deck is all about getting lots of counters (see Word Soup custom section) onto Kathril, Aspect Walker or Skullbriar, the Walking Grave. Then, you swing out really big and try and drop people's life totals down to zero. The below stuff is how to best optimise that word soup. Because sometimes, the game progresses in such a way that you get a turn 1 drop of Dreadmalkin or Banehound or a Bassara Tower Archer and they die early on, which means you don't want their menace / lifelink (remember you can't pick up Haste with Kathril!) or hexproof & reach respectively. Then midgame, you find a way to tutor for another card and dump it straight into your graveyard, so you'll want to avoid overlap. The best combo is with Zetalpa and Bassara Archer, because then you've got a 10/10 indestructible, hexproof, doublestrike commander. That scares people. But sometimes people play graveyard hate and you lose Zetalpa, Primal Dawn, or you draw Akroma, Angel of Wrath or Sunblade Angel early instead with general milling off the top of your library. These 4 combos are to help you figure out what is the best way around it all. Either Akroma for trample or Sunblade to give you a basis of 4 buffs (the only difference on them in terms of being in the graveyard is Akroma has trample, Sunblade has lifelink).

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Best Word-Soup Combos

Combo 1 - Standard Kathril, Aspect Warper

Gets +7/+7, indestructible and Hexproof to be really resistant to removal

Zetalpa, Primal Dawn 1st (for Flying, double strike, vigilance, trample, indestructible) and Bassara Tower Archer (hexproof, reach)
Net gain - +7/+7, flying, double strike, vigilance, trample, indestructible, hexproof, reach (give reach to another creature on the board)
At this point, you're looking for Vampire Nighthawk (deathtouch, lifelink) and Dreadmalkin for menace

Combo 2 - Aggressive Kathril

Zetalpa, Primal Dawn 1st (for Flying, double strike, vigilance, trample, indestructible) then second Vampire Nighthawk (flying, deathtouch, lifelink)
Net gain - +7/+7, flying, double strike, vigilance, trample, indestructible, deathtouch, lifelink
At this point, you'd then be looking for Bassara Tower Archer to get the hexproof, and Dreadmalkin for menace

Combo 3 - Akroma Standard

Akroma, Angel of Wrath (Flying, first strike, vigilance, trample) and Oketra the True (doublestrike, indestructible)
Net gain - +6/+6, flying, first strike, vigilance, trample, doublestrike, indestructible.
Next goals - Kunoros, Hound of Athreos for menace, lifelink

Combo 4 - Sunblade Angel lifelink

Honestly, this is like a last resort. I prefer trample over lifelink, but if you're in dire straights and you need hp, lifelink is sometimes better than trample
Sunblade (Flying, first strike, vigilance, lifelink) and Oketra the True (doublestrike, indestructible)
Net gain - +6/+6, flying, first strike, vigilance, lifelink, doublestrike, indestructible

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Word Soup Notes

Indestructible - Oketra the True, Zetalpa, Primal Dawn and Karametra, God of Harvests
Hexproof - Slippery Bogbonder, Bassara Tower Archer
Double Strike - Oketra, Zetalpa
Deathtouch - Void Beckoner, Vampire Nighthawk
Trample - Doom Whisperer, Akroma, Titanoth Rex, Zetalpa

Observations

• Skullbriar, the Walking Grave is an alternate win-con. If you put the counters of word soup onto him instead of Kathril, those counters stay on him if he dies and goes to the graveyard.
• Deck probably could benefit from finding a way to get Acidic Slime or Skullwinder in to get another Deathtouch source in. I probably would suggest getting rid of Rankle, Master of Pranks, as I originally put him in when I thought Kathril could pick up Haste (other creatures like Odric, Lunarch Marshal and Cairn Wanderer can pick up Haste though). However, I discovered that like making my opponents mill a card out of their hand as it strips them of gas, and I can discard an expensive Zetalpa or Akroma from my hand without getting them out onto the battlefield.
• My pod rather seeing Zetalpa or Akroma on the field than in my graveyard, and will go to lengths to not kill them at times. Ironic really to see them go "I'd rather this 6/6 word soup than a Kathril which is worse".
• It's generally better to cycle Titanoth Rex or Void Beckoner than to play them. However, under certain circumstances, you can get the counters onto them and they are rightly dangerous big monsters.
• Skullbriar, the Walking Grave is an alternate win-con. If you put the counters of word soup onto him instead of Kathril, those counters stay on him if he dies and goes to the graveyard.
• 9/36 (25% of the lands) are tapped lands. This is a budget restriction unfortunately, a few fetch lands couldn't go astray if you have them to use.
• This deck is really trying hard to get the mid-game to function, with lots of focus on tutoring and milling. Once you've got the important stuff in the graveyard, those cards don't really help as much as you'd like because the recursion isn't as strong as it could be. Voltron commander decks are incredibly reliant on their commander, and something really inopportune like a Pongify that is "turn creature into a useless thing without abilities" is kinda rough. The deck doesn't really pivot or avoid those spells well, but it can be done by putting counters onto Titanoth or onto Skullbriar.