I hear Yugioh did the same thing, which really messed up the balance early on
Every creature-based sacrifice outlet stops working
Almost always, in nearly every format, some players try to make Mill work even if it's not necessarily competitively viable
Commander, which is reminiscent of a former game format called Elder Dragon Highlander, or EDH, is a format where players build a 100 card singleton deck, built from the card colors contained within the color identity of the commander of the deck, which must be a legendary creature or one of the special Commander planeswalkers created by Wizards of the Coast
Ayaras mana cost of 3 is made up for in its role as a card-drawing sacrifice outlet
Its like a suped-up Auspicious Starrix, and by suped-up, I mean bonkers good