The card's design is pushing Izzet colors if you want a Room-centric deck (at least for now), which is instantly a departure from the usual instant/sorcery focus we're accustomed to seeing
While in the edit view, you will click on Accessories and be able to choose your sleeves from there
Generally speaking it will be built without too many cards that negate effects, given that people that play them, want to experience the adversaries strategies at their fullest
The authenticity is always checked with the quality of print, the holographic images and official Pokemon logo
I think the cards extreme value comes from a combination of uniqueness, historical importance, and collector mythology
Let us know how it plays out, and which cards youre excited to add to different decks