No one is forcing anyone to look at leaked cards.
If you don't want to see spoilers, stay out of the threads that are likely to contain them.
As an aside, I wouldn't mention "high horse" when you're on your own about "saving them happiness."
Not everyone's Christmas is ruined by seeing the gifts. Not everyone wants/likes surprises.
Niv-Mizzet gets by on the fact that his ability does not actually require that you cast a spell, it triggers on card draw of any kind (so Azami + MoM can trigger it for example). He also has an instant kill combo for just 1 more mana in Curiosity (along with more complex or expensive comboes). I don't expect Arjun to win on his first trigger without alot more set up than Niv-Mizzet takes. That said, outside of instant kill combos, no I actually don't like Niv-Mizzet that much. If he didn't have his instant kills he wouldn't see play most likely (see Dracogenius).
I'm honestly surprised that Ajun and Ezuri are the ones you single out as best when IMO both Golgari Commanders and Mizzix (maybe even Karlov) stand above both. Still I guess we'll see when they start getting played.
I mostly don't like Ezuri because he isn't interesting to me for a G/U commander. Momir is more along the lines of what I want G/U to do. Not put some counters on a single creature once a turn...
Arjun - 2. Meh. He's vaguely interesting I guess but I see no reason to use him. He's expensive, fragile, and provides little immediate value usually.
Daxos - 3. Average. Semi-cheap token maker. I'm not impressed but I wouldn't be surprised to see him played either.
Ezuri - 3. Probably worth a 4 but I just don't like him personally. +1/+1 counter guy. I'm not impressed here either but he does have combos.
Kalemne - 1. Dumb beater which Boros already has plenty of. Not as bad as Anya but there was no 0 option for Anya.
Karlov - 4. Very, very good. Could honestly be a 5. Strong, super cheap, good ability. This is a good beater, pay attention Boros.
Kaseto - 2. Meh. At least he's cheap and can be a mana sink. That puts him over the Boros options.
Mazirek - 5. Awesome. Will win games often and easily. Semi-expensive at 5 but should end games on the spot when played so who cares?
Meren - 5. Awesome. Great value for the cost. Plays the slower grindy game rather than the big finish.
Mizzix - 5. Awesome. Could be a 4 because you really need to untap with her to get the value. Still if you get to untap you should win.
So there you go, could move Karlov up and Mizzix down but otherwise I'm happy with those ratings.
Cryptic is better in a number of ways, sure but that doesn't make this any less of a powerful spell and better in some situations.
Heck if it triggered on upkeep your complaint about her being graveyard centric would carry more weight. Since it triggers on end step, again outside of instant speed answers, you can choose to cast her when you know you'll get something back.
*Looks at Gatherer R/W Legends* ...Ok fine wizards, I guess I'll take that back because a vanilla 4/4 flyer for 5 is actually better than some of your past R/W Legends (poor Boros) but still, this card is insulting. I certainly wouldn't be bashing Basandra in a thread with this card. Basandra is at least moderately interesting (with good art), this is not...
Personally I'd gladly take bad regrowths over bad removal/artifact destruction. I can work around regrowths because they are a factor I can control with my deck building/game play. Artifact destruction and pyroclasms (or randomly getting to snipe a planeswalker, which I would be impressed to see happen with the red confluence) are only good in certain situations and are dependant on the opponent's deck/play.
The way I see it the Green Confluence is all about 3xRegrowth with a few extras when you can't do that. The Red is Artifact Destruction or Pyroclasm and it just depends on the situation as to which you pick. With Regrowth I can get better Artifact Destruction (Regrow Bane of Progress) or a Card Draw/Tutor Engine (Sylvan Library/Survival of the Fittest) or a Proactive Threat. With Pyroclasm or Artifact destruction modes I can get those two effects... And Pyroclasm isn't an effect I'm all that interested in. I'd rather have Molten Disaster, Star Storm, Blasphemous Act, ect...
Red is Artifact Destruction or Pyroclasm+1... Honestly I'd much rather have the green one most of the time.
Stroke of Genius over other x draw spells since colored mana will be your bottle neck here.
Naturally all of the Wheel of Fortune, Timetwister, Time Spiral, Windfall style cards...
Anyhow, yep, gotta love the fact that someone felt they had to ask if Gaddok Teeg was "bad manners" in EDH. For a supposedly casual/fun format I've seen few that are as mean or toxic as this.
Your posts (and many other posters in the official banlist thread) also just further cements for me that the idea of "social contracts"/"Spirit of EDH"/"self policing players" is a terrible basis for a banlist because people can oh so easily be petty and cruel. The very idea that someone would not want to use the RC's banlist (for whatever reason, and not all of those reasons include sol ring or whatever card might be argued) is apparently so unacceptable that you need to come to this thread just to insult/mock/troll/ect.. at those who are actually putting in effort into this. I would hate to try playing a "social" game with you and many other vocal champions of the "casual EDH" set.
If this thread is so doom to failure because the concept simply cannot work then there isn't any reason for you to bother with it, no? Let it die and leave those who want to struggle in vain with it to their own devices.