相殺 {U}{U}

エンチャント

いずれかの対戦相手が呪文をプレイするたび、あなたは自分のライブラリーの一番上のカードを公開してもよい。そうした場合、その呪文の点数で見たマナ・コストと公開したカードの点数で見たマナ・コストが等しいなら、その呪文を打ち消す。

Illustrated by John Zeleznik

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Coldsnap #31

Only the English version of a Magic card receives Oracle updates and errata. View this card in English. (Scryfall note)
If an opponent casts a spell with X in its mana cost, the mana value 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 mana value 2, but it won't counter that spell if you reveal a Blaze of your own. (2006-07-15)

If an opponent casts half of a split card (for example, Hit), it won't be countered if you reveal that same split card. The mana value of a split card is determined by the combined mana cost of its two halves, but the mana value of Hit is determined using only that half's mana cost. (2017-04-18)