These debuted before the Horde was in the Wombat Dungeon Master games and there are a couple of cards that got a major MP boost. Those became valuable and a big pile of packs sold and not very many blends have been made.
The pack sales had to close because it was obvious that the market would be flooded if allowed to continue. We got enough hate from some collector investor types to learn a little about over saturation. 

546 SOLD and 511 BURNED 

Is this the blend that needs to happen?