You browse a Japanese store, send the item link to the proxy, they purchase it, and then ship it to you
These decks utilise cheap spells - or in Lorcanas case, actions - that replace themselves with card draw to get value out of cards that incentivise you to be playing multiple cards per turn
Each Mini Tin comes with two 30th Celebration booster packs, a sticker sheet, and an art card that matches the Mini Tin
Like most Pokmon cards, the value of Kirlia depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Legendary Treasures)
This is a pretty tricky way to get a promo card since there aren't many of these at the moment and Mewtwo is a very hard card to come across even once
A shared planar deck must contain at least 40 cards (or 10 cards for each player, whichever number is smaller) and not more than 2 phenomenon cards per player