Mana Crucible

At the beginning of your upkeep Mana Crucible
deals X damage to you, where X is double the
amount of force tokens on Mana Crucible.
{x}{x}, {t}: Put X force tokens onto Mana Crucible.
{0}: Remove a force token from Mana
Crucible, add {c} to your mana pool. (Play this
ability only if you could play a sorcery)