Counterbalance

Enchantment, UU (2)
Whenever an opponent plays a spell, you may reveal the top card of your library. If you do, counter that spell if it has the same converted mana cost as the revealed card.
Illus. John Zeleznik

Crystal Keep Rulings Summaries

• Note - Also see Converted Mana Cost, Rule G3.29.
• Note - Also see Mana Cost and Color, Rule 203.

Format Legality	Legal in Vintage, Legacy, Extended Banned in Standard
Printings (1/9)	Coldsnap (Uncommon)