Each opponent can't cast noncreature spells with mana value greater than the number of lands that player controls. Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell.
I told Jace that Ravnica would fall apart if he didn't take his responsibilities seriously. I didn't want to be right.
Near Mint - $3.10
Lightly Played - $2.80
Played - $2.20
Heavily Played - $1.90
Damaged - $1.60
Near Mint Non-English - $3.10
Lightly Played Non-English - $2.80
Played Non-English - $2.20
Heavily Played Non-English - $1.90
Damaged Non-English - $1.60