Strong cards are everywhere, and we could talk much more about the many implications of the cards
Saheeli, the Gifted is a fine commander, with her ability to add a bunch of mana with her second +1 being especially scary, but she suffers from the fact that there are a bunch of artifact-based Commanders available, including the extremely powerful Breya, Etherium Shaper, so being "fine" might not be enough to pick Saheeli, the Gifted as your Commander over other options
The majority of the Japanese Terastal Festival cards will appear in the English set Prismatic Evolutions , which will be released on January 17th, 2025
To protect them, keep your cards in protective sleeves and store them in a cool, dry location, away from direct sunlight