With Standard rotation coming very soon and the next announcement scheduled for November, Final Fantasy cards are generally positioned as they were planned by WoTC, much to my contentment
As your knowledge grows, so does the dangeronly the most skilled mages will succeed
This card works very well in Commander decks that dont let the mana empty from the mana pool, like Kruphix, God of Horizons, or cards that let you untap your permanents, like Seedborn Muse or Wilderness Reclamation
Teferi's last ability means that in order for an opponent to cast a spell, it must be that opponent's turn, during a main phase, and the stack must be empty
But even with a whopping 100 legends in the main set, we couldn't get everybody