Johralis Silencer

If Johralis Silencer is in your opening hand, you may begin the game with it on the battlefield.
At the beginning of each opponent's upkeep, choose a color. Until end of turn, spells of the chosen color he or she cast cost {2} more to cast and spells of the chosen color you cast cost {2} less to cast.
Used to empower its user's spell power while also repress the others.