Fractured Powerstone

• WWizards of the Coast2012-06-01
  Official Ruling
  In non-Planechase games, Fractured Powerstone's second ability will have no effect.
• WWizards of the Coast2012-06-01
  Official Ruling
  Rolling the planar die this way doesn't count when determining the cost of the special action of rolling the planar die. For example, if you roll the planar die twice in a turn, then activate Fractured Powerstone to roll it a third time, rolling the planar die again that turn will cost .

Rulings via Scryfall