name: Counterbalance
originalText: 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.
printings: CSP, MB2, MP2, PLST, SLD
text: Whenever an opponent casts a spell, you may reveal the top card of your library. If you do, counter that spell if it has the same mana value as the revealed card.
type: Enchantment