The Thran learned to capture mana, but power inevitably escapes its bonds.

Fractured Powerstone

{T}: Add {C}.
{T}: Roll the planar die. Activate only as a sorcery.

March of the Machine Commander

The List

Planechase Anthology

{T}: Add {C} to your mana pool.
{T}: Roll the planar die. Activate this ability only any time you could cast a sorcery.

Planechase 2012

{T}: Add {1} to your mana pool.
{T}: Roll the planar die. Activate this ability only any time you could cast a sorcery.

In non-Planechase games, Fractured Powerstone's second ability will have no effect.

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 {2}.