Also, I edge out this one because I dearly love the Mayan inspired artwork of Mark Poole
If you brought in a non-creature permanent to dodge a powerful removal suite, they couldnt kill it with the same card that killed your one-drop
This Soul Sister enchantment might have an argument for being better than Authority of the Consuls, since you can plan to play into it with your own creatures, but I think the stax effects from the Kaladesh rare might outclass it
Niv-Mizzet, Visionary Niv-Mizzet, Visionary allows me to do something I didnt think I wanted before, and thats to turn Lightning Bolts into Ancestral Recalls
Commander players generally dont want to waste their entire turn of mana just to remove one creature unless they are about to lose the game
After my initial rejection of the idea, I think this new set of cards can set an interesting precedent