Scarcity, or how much of an item is available at any given time, and rarity, how difficult it is to acquire, play a role in determining prices as well, Fang said
Crystals The full colored cycle of Crystals reduce costs, and each one has a static ability and an activated ability, so the 4 mana value slot is a key one to launch you into the the biggest and strongest cards, and rely on 2-mana rocks to curve into these on turn 3
For arbitrage between back prices and an Exchanges lay prices, see the Back/Lay Arbitrage layer
The image on the back doesnt scrape off or chip from shuffling, which presents an incredible amount of friction and wear on the sleeves
Limited Release
Though the death clause is a fine consolation prize, it's disappointing in a format as powerful as EDH." After browsing her decklists, I totally get it now