Secret Lair Drop

Trinisphere

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.)

Double Masters

"This exhibition of Nehra's Threshold Principle must be expropriated and examined for its potential applications in enforcement."
—Confiscation directive

Kaladesh Inventions

As long as Trinisphere is untapped, each spell that would cost less than three mana to cast costs three mana to cast.

Designed to restrain petty thoughts, but used to repress entire empires.

From the Vault: Exiled

Darksteel

As long as Trinisphere is untapped, each spell that would cost less than three mana to play costs three mana to play. (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 play costs {2}{B} to play instead.)