Counterbalance is a uncommon Enchantment card from Magic: The Gathering (Mystery Booster 2, MB2). Current market price: $3.59.
Uncommon
Mystery Booster 2 (MB2)
{U}{U}
Mana Value
2
Colors
U
Card 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.
