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.)
Near Mint - $9.600
Lightly Played - $7.700
Moderately Played - $6.800
Heavily Played - $5.800
Damaged - $4.800
Near Mint Spanish - $9.600
Lightly Played Spanish - $7.700
Moderately Played Spanish - $6.800
Heavily Played Spanish - $5.800
Damaged Spanish - $4.800
Foil Prices
Near Mint Foil - $14.900
Lightly Played Foil - $11.900
Moderately Played Foil - $10.400
Heavily Played Foil - $8.900
Damaged Foil - $7.500
Near Mint Foil Spanish - $14.900
Lightly Played Foil Spanish - $11.900
Moderately Played Foil Spanish - $10.400
Heavily Played Foil Spanish - $8.900
Damaged Foil Spanish - $7.500