The Sunshard Glebe is a promo pack that was sent out to people who filled out a survey about Mystic vale.
The Sunshard Glebe advancement has a cost of seven mana. It provides five mana, as well as two victory points at the end of the game.
The promo pack includes 3 Sunshard Glebe advancements (one advancement for the top, middle, and bottom slots).