It plays off of hero synergies, whether you've got Captain America being buffed as they enter, or Nick Fury reducing their cost, and is remarkably easy to play with
They are the rarest Magic cards since they are printed in limited numbers, typically just 50 per type (regular/foil/etched/etc.) per set the card art is printed in, and only given to the artist
Some stores try to move boxes that have been sitting on their shelves for years
When you see Artifact - Equipment on a card, you know the Artifact will have an equip cost and be attachable to a Creature
The Magic: The Gathering Final Fantasy cards will see their official release on June 13th
It is not unlike many of the variable mana cost mechanisms like kicker or level up, all of which are good in the same regard however it has this elegance that the others lack that really gives it aesthetic appeal