It also eventually represents a later threat of Chalice on two, making the combo very hard to assemble, meaning multiple Chalices are good even if that decks best answer is the three-cost Teferi, Time Raveler
It's out of the game
Lorehold, the Historian I had a hard time saying no to the other elder dragons from Secrets of Strixhaven
It was just so unrecoverable with there being little to no removal back then for planeswalkers
Beyond being a sheer card advantage engine, Azami also has some very achievable combo finishes: Isochron Scepter plus Dramatic Reversal is the tried-and-true combo line to untap all your mana rocks and Creatures repeatedly and adding Azami to the mix turns those untapped Wizards into unending card draw each loop
Other elements include physical scarcity, competitive viability, nostalgia, sentimental value, and cultural impact