I think this is an auto include in Moggwarts to help out the combo turns but also to get rid of those pesky artifacts at instant speed without interruption
Six mana is quite a lot, but I can see Ysthola fitting well into both flicker decks and decks that mess with upkeeps and endsteps
This marking indicates that it comes from the very first print run of the card, which gives it a special status among collectors who seek authenticity and age
Its your choice after all
There are also a fair amount of rare cards to be found in the Sword & Shield - Brilliant Stars Trainer Gallery
I've got plans already brewing to put together a Commander deck around Golbez, Crystal Collector, filling up my board with treasure and food token generation via cards like Nuka-Cola Vending Machine, Academy Manufactor, Currency Converter, and more