While this is functionally identical to its white successor, this card loses a few points for me because decks including blue are less likely to benefit from a hard Rule of Law effect because they have access to better stack interaction and combos that don't play nicely with these effects
We lose two and get the Demon, they lose eight and get a weenie
They're all great as Commander options, try them out
Herigast, Erupting Nullkite Marcy: I think this might be one of the better Emerge cards, especially since it gives everything else Emerge too
First, she has to tap, so barring haste you'll have to wait a turn
Ending with a 7/7 flying creature with a ward and a +3 on hand is something your table will surely not let pass that easily