Youre encouraged to use the cards in casual formats, though you can always bring this up as a Rule 0 discussion with your playgroup about potentially including cards that aren't technically legal
Shaun, Father of Synths At the time of writing, Shaun has fewer than 500 decks on EDHREC and I cant figure out why
Finally, enjoy the hobby Pokmon cards are about fun first
Part of a cycle that features the almost-as-broken Gaea's Cradle and somehow the hilariously unbroken Shivan Gorge, Tolarian Academy taps to make a mana for each artifact you control, which led to decks that would dump their entire hand of cheap artifacts, make a ton of mana by tapping and maybe untapping Tolarian Academy, and then use big card-draw spells like Windfall and Stroke of Genius to refill before eventually milling the opponent out with Stroke of Genius, potentially all on Turn 1
At carton level (12 boxes), Japanese opening data suggests approximately 2 total SA pulls, giving roughly a 50% chance of seeing the Giratina V SA in one carton