As it stands, just eleven of the 72 have been graded, with four in PSA 9s and one PSA 10
Historically, Pokemon of the Year characters and debut cards tend to appreciate
In other words, we get 3-4 mana worth of value each time we cast a noncreature spell large enough to draw two cards (not to mention Hero tokens)
The intricate, artistic style of artifice associated with Kaladesh proved an ideal fit for many of Magics best artifacts, while the framing, both in terms of the overarching Inventors' Fair device and the literal gilt frames used on the cards, was very well-received
You cannot trade Promo cards or anything rarer than Art Rare
This is an incredible setup that costs little energy and can be put together fast in battles