Trinisphere [Double Masters] XY177a Whenever a Dragon you control

Whenever a Dragon you control attacks

Search its controller's graveyard

Reverse Type: Land {T}: Add {G}

Nightmare's power and toughness are each equal to the number of Swamps you control

Set: Legendary Collection Type: Psychic Rarity: Holo Rare Retreat cost: Colorless

Trinisphere [Double Masters] XY177a Whenever a Dragon you controlSet: Double Masters Type: Artifact Rarity: Mythic Cost: {3} 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 {1}{B} to cast costs {2}{B} to cast instead.)