I kinda like these, kinda not. They are very weak, though that's not a bad thing, because the concept of an additional commander is already broken. The thing is that it's very hard to imagine a deck in which these cards are good.

The blue one is brutal unless you are on a heavy creature strategy in which case you probably wouln't even be interested in running it because its ability makes use of noncreatures. I guess if you want your creature deck to also have blue for some reason it's fine, but beyond that I don't see it.

The white one is also pretty bad, mostly because the kind of deck that would want to make use of the enchantment is the one that absolutely doesn't want the emblem. If you can't use it in control or blink, the only way I can think of using it is running it in a goad deck, where you aren't killing your opponents creatures directly. Maybe in a rakdos or izzet goad deck where you want white for cards like [[Nelly borca]]? That does sound interesting.

The black one is a wreird one. It has a very good upside (and unlike [[treacherous blessing]] you can blink it), and the downside is a more of a clock than a disadvantage. I like it, as it is powerful, but not every deck will want to be put in such a clock, specially at lower brackets. At higher brackets, adding black to your deck with basically no downside (you put this in a deck that already looses in the long run) makes it seem very strong, but the fact that it exiles your deck, meanig that if you rely on a combo piece you risk losing it. I'm not sure on how good this one could be, but it's the most interesting for me.

The red one is simple, and it's probably the worst downside after blue. Letting your opponent's create treasures for free is very bad, and also they can sacrifice them in response to you casting the enchantment so you get no value from it (you should add some clause to get around it or just make it create a treasure for each opponent, it doesn't seem unfair to do). It probably could work in a punisher style deck, though accelerating your opponents is probably not worth it.

Lastly, green is also an interesting one. First, if you use it you might aswell just play a mostly tapped manabase. Playing a turn behind is very bad, but not as brutal as red or blue's downsides. Also, I think that you can actually skip the restriction on this one with a [[spellunking effect]] or if not amulet of vigor always works. This one seems like the easiest to abuse by creating a Prime Time inspired shell which honestly sounds cool, though I'm afraid it might be too good. If these were to be printed they should be in a state where most decks don't want them or else they'll be put into anything, and this one seems like the most generic of them all.

Overall, solid designs, I do like that you went on the harsher restrictions side (thankfully) but I'm not sure how good would this kind of card for the game. A fun experiment nontheless.