Rulings

• 2004-10-04
  The generic X cost is still considered generic even if there is a requirement that a specific color be used for it. For example, “only black mana can be spent this way”. This distinction is important for effects which reduce the generic portion of a spell’s cost.
• 2004-10-04
  This can lower the cost to zero, but not below zero.
• 2004-10-04
  The effect is cumulative.
• 2004-10-04
  The lower cost is not optional like with some other cost reducers.
• 2004-10-04
  Can never affect the colored part of the cost.
• 2004-10-04
  If this card is sacrificed to pay part of a spell’s cost, the cost reduction still applies.
• 2023-07-28
  The ability doesn't change the mana cost or mana value of any spell. It changes only the total cost you pay.
• 2023-07-28
  The ability can't reduce the amount of colored mana you pay for a spell. It reduces only the generic mana component of that cost.
• 2023-07-28
  If there are additional costs to cast a spell, or if the cost to cast a spell is increased by an effect (such as the one created by Thalia, Guardian of Thraben's ability), apply those increases before applying cost reductions.
• 2023-07-28
  The cost reduction can apply to alternative costs such as flashback costs.
• 2023-07-28
  If a spell you cast has in its mana cost, you choose the value of X before calculating the spell's total cost.