This mechanical niche has heretofore been a bit of a hidden gem, especially the idea of building around it but that seems to be changing now, and quickly
I do agree that FF5 deserves more though. apstrac2, via r/MagicTCG Theres also the fact that the reused characters in Final Fantasy XIV get a lot more development in that game
As for the rest, we're looking at the natural design trend we've been seeing ever since Dark ConfidantDark Confidant: Creatures are easily removable, so it's easy to put powerful card advantage mechanics on them for cheaper than you'd see them otherwise
Bracket three is where most "average" Commander decks are, whereas bracket four houses decks that are very strong, but not quite cEDH tier
Rosewater called these deciduous mechanics, concepts so fundamental to the game (like trample or flying) that we all take them for granted
As the final mythic rare in the modal DFC cycle, Agadeems Awakening takes the flexibility of these cards even further