Trinisphere (303) [Double Masters]Rarity: M #: 303 Creature Type or Sub Type: Artifact Rules Text Contains: As long as Trinisphere is untapped, each spell that would cost less than three mana to cast costs three mana to cast. (Additional mana in the cost may be paid with any color of mana or colorless mana. For example, a spell that would cost 1B to cast now costs 2B to cast instead.) Set: Double Masters Number: 303