Contrapesar

Encantamiento, UU (2)
Siempre que un oponente juegue un hechizo, puedes mostrar la carta superior de tu biblioteca. Si lo haces, contrarresta ese hechizo si tiene el mismo coste de maná convertido que la carta mostrada.
Illus. John Zeleznik

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 converted mana cost as the revealed card.¹

Gatherer Card Rulings [Nov 2009]

• 7/15/2006: If an opponent casts a spell with X in its mana cost, the converted mana cost of that spell takes the value of X into account. If you reveal a card with X in its mana cost, X is 0. For example, if your opponent casts Blaze with X=1, Counterbalance will counter that spell if you reveal a card with converted mana cost 2, but it won't counter that spell if you reveal a Blaze of your own.
• 7/15/2006: If an opponent casts half of a split card (for example, Hit), and you reveal a split card where half of it has the same converted mana cost (for example, Hit/Run or Stand/Deliver), Counterbalance will counter the spell.

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