Mirror is fine. We basically just got the same card in HOU but the cheaper cost is nothing to overlook. Any dedicated tribal deck would love this card. Copying lords at instant speed can really have a huge effect on the battlefield. The name just makes me want to copy grizzly bears though.
also, most of these "super pushed" tribal cards are not really pushed when they are all 5-7 mana. They might be able to steal games at a casual table but any group running moderately powerful decks definitely do not want these. You can get much more impactful spells at the same mana cost in pretty much any color.
See, I considered mirror in my various tribal decks and I didn't included it not because of the cost, but simply because I didn't want that type of effect. When you only have a couple really good target and a bunch of other ok ones it doesn't seem worth the space.
Given what I've seen when I've played commander with random people the average commander deck isn't all that powerful. Like I know if I wanted mine can be optimized a ton more and I felt like I had the best or second best at every table I ended up playing at.
Anyway, thoughts on the new cards.
I think Licia is fine. We have enough cost reduction that I don't see it being all that hard to cast her for MNO most of the time and she can kill pretty fast.
Steward is meh. We have tons of better ways to give haste to commanders.
Decorum is really powerful. Have the table kill each other and then kill whoever is the weakest since everyone is going to be pretty open after this is cast.
Honor Guard seems bad.
White Curse looks terrible, but all the others look solid.
Protection is a weird protection spell, but it does a hell of a job. Seems like an interesting option to protect your board.
Markov seems really good. I know when I build my tribal decks getting the critical mass of the tribe out can be hard since most tribes only have one or two really good token makers. The fact he can double as an anthem is just gravy. I know we're getting white vamps in Ixalan so I might end up making a tribal vampire list when we get the full spoiler for that.
Tribal Control Magic that can't be undone is nuts.
Mathas seems fine. Nothing all that interesting imo.
Charge seems like it can be really powerful in the right goblin build. Not sure if I'd put it into my Grenzo list though. Side from goblins dragons might be able to use it since the things you're coping are so big, but you're just as likely to just want another big dragon.
I really like Patron. Removal and anthem effects stitched together are powerful.
I really like Blade. Even outside of dedicated tribal decks it is pretty easy to have a couple worthwhile things you can hit with it. My Kemba list isn't tribal focused, but for sure going to find space in it for this. Wish it didn't randomize the order since I'd also slam it into Grenzo, but it might still make the cut. Don't think my other tribal decks (Slivers and Elves) want this though.
Agree Inalla is weird. I'm not versed enough in the wizards we have in the game, but my first instinct is that they aren't really things you want to be making temporary tokens of. The burn effect is also super random.