
As long as this artifact 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.)
Trinisphere has 8 printings, first in Darksteel (2004). EDHREC ranks it #5,361 among Commander cards. It appears most in Urza, Lord High Artificer decks (3,646 on EDHREC). It has 2 official rulings.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.