There are many reasons one might collect cards from the Scarlet & Violet era of the Pokmon TCG, first and foremost is the Terastal phenomenon, and return of 'ex' cards which adds a new, unique strategic consideration to the playing card game
When Embalming Tools got killed, we changed Embalming Chamber to Embalming Tools because we thought it was a better card concept
Or an e-reader
While this list is specifically based on my cube, PowerMack, I believe it broadly translates to most Vintage Cubes
This deck was already a fringe deck in Modern, but Oath of Nissa might be exactly what it needed to propel itself firmly into the sphere of competitive Modern decks, especially since this is another deck that can use the recent big mana offerings well and might want something like Ulamog, the Ceaseless Hunger or even World Breaker, both of which, of course, Oath of Nissa can help find when you need it, giving you a different sort of flexibility, offering a card that does what others couldnt