would Transguild Courier be too good? I mean it's "5 colors" but really you can be doing some 2 color shenanigans while having cards of other colours that interact with them all (say, reanimator). I haven't tried the format, but it does seem interesting

5-color would be very interesting. I ran a Paragon of the Amesha deck for a minute and it was pretty cool. It was based in blue and green for ramp and draw with enchantments from all colors, also all of the good board wipes. It was fun but I'm not a big fan of voltron.

Nemesis of Mortals is pretty good in my play group, green ramp plus mana elves to chump.

Mistmeadow Skulk is a really great pauper voltron commander. Drogskol Captain is ridiculous too, although not very fun to play against. Not sure how the other DKA lords would do (Diregraf Captain, Stromkirk Captain).

Some other viable ones I've found are Mistfire Adept, Corrosive Mentor, Marchesa's Smuggler, Ogre Marauder, Skull Collector, Species Gorger, and maybe Firebrand Ranger.

I have a fun Boldwyr Intimidator deck, and I'm working on a Ruthless Deathfang deck and a Spiraling Duelist deck. Spiraling Duelist and Ruthless Deathfang can be pretty brutal in the right builds.

Cowards Can't Block Warriors! // Ruthless Deathfang Pauper EDH // Spiraling Duelist Pauper EDH

I have Cunning Breezedancer from the recent cycle all plotted out for some good ol' Voltron-styled goodness. In a playgroup I have with Catonian we use 30 life and 18 Commander damage so one noncreature spell makes it into 6 power for the magic 3 turn clock.

Also Harbor Bandit seems a fun voltron commander with a built-in activated evasion.

Krosan Warchief for a mono green beast tribal.

Suggestions from newer sets:

ORI

Jhessian Thief (prowess voltron with card advantage)

Gnarlroot Trapper (Elfball, with the ability to make combat risky for any player)

Sentinel of the eternal watch (lockdown deck)

DTK

Ruthless Deathfang (to make good use of all the old "sacrifice this creature, do X" cards)

Salt Road Ambushers (morph Lord)

Strongarm Monk (prowess for everyone!)

FRF

(This is the farthest back I'll go, I swear)

Mistfire Adept (like a mini Tibor and Lumia)

Elite Scaleguard (Unblockable alphastrikes with buffed creatures)

Quarsi high priest (Never lose board position with a chump block)

Mardu woe-reaper (grave hate and lifegain in white?)

Young Pyromancer is a Tier 1 deck. There's a guy at my LGS with a tuned version that can stomp real EDH decks.

If wastes is real, Im thinking Arcbound Crusher could be fun.

Definitely, that seems like a blast. I've been trying to brew a colorless deck for a while but it's pretty difficult currently. And I'll add Young Pyromancer to that section. How well is it able to do on a multiplayer table?

I have yet to see a multiplayer game with his decklist, but given that he basically ensures no utility creatures stay for more than 1 turn and floods the board pretty quickly, I think he could handle 2 or maybe even 3 decks teaming up against him. It depends how many of them can consistently draw sweepers against him.

Stun sniper, serene steward, and Ajani's pridemate would be good commanders.

There are a lot of cards from bfz that have great potential.

eyes2sky. lookit

Blightcaster

Martyr of Frost

I had a good time trying to make Epochrasite work. I played literally every legal land except Terramorphic Expanse/ Evolving Wilds, 4 affinity cards, pretty much every creature, equipment, or cantrip with cmc 0-2, Whispersilk Cloak, 3-4 other 3 drops, and then finished off with anything else <2cmc which was even remotely close to playable like Squee's Toy. I replaced these last with Bronze Sable and Keeper of the Lens et al upon their release. Even if the rest of the dank was janky as heck, a 4/4 for 2 that recurs for free is some good. With wastes now I suppose I don't have to be slavish to the low curve anymore, but might keep squee's toy in just for nostalgia.

I also had fun with Tallowisp and Auratouched Mage.

Aven Mindcensor could be good in search heavy metas.

Crypt Rats has been printed as uncommon as well as common.

How is Lumberknot not in the top tier for this? Lumberknot is a basically a Skullbriar, the Walking Grave in this format.

Lumberknot is ok. It requires a lot of investment, though, and mono-green has very few ways to insure that it can put those counters on it before the Black or Red player pings it to death with Crypt Rats et. al.. Once it gets rolling though it's not going to die, short of a Chainer's Edict.

I don't know man, play anything that puts out eldrazi spawn or scions and you can get those counters pretty fast. I have seen lumberknot hit the table and just become unstoppable. Then you have "fight" effects from green which ensures you some removal and pump. Then you have greens ability to put trample out there.

I could see it. You should put a list together.

Pious Evangel  ^Flip

Town Gossipmonger  ^Flip

Ulrich's Kindred

Veteran Cathar

Aberrant Researcher  ^Flip

Autumnal Gloom  ^Flip probably isn't legal, same league as Elberus.

Duskwatch Recruiter  ^Flip is awesome as a commander, especially when it flips.

Breakneck Rider is a good choice as well.

Reaper of Flight Moonsilver is great in white tokens builds - easy ways to achieve delirium and lots of fodder for one-shotting people.