Counterbalance

Counterbalance

    U U
Enchantment

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.

illus. John Zeleznik # 157/264

Oracle 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.