Text (SM): 4/4. ; {Tap}: Add {4} to your mana pool. Spend this mana only on costs that contain {X}.
The {X} can be in any portion of the spell or ability's cost, including an additional cost. This works even if you choose X to be zero. [Shadowmoor FAQ 2008/04/21]
This mana may be spend on the non-{X} part of the cost, as long as the cost has an {X} part to it. [Shadowmoor FAQ 2008/04/21]
You do not have to spend all four mana on the same spell or ability. [Shadowmoor FAQ 2008/04/21]
