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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.
Jul 15, 2006 · 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.
Apr 18, 2017 · 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.
| Archetype | Format | Inclusion | Copies | Decks (n) |
|---|---|---|---|---|
| Jeskai Stoneblade | Legacy | 100% | 1× | 4 |
| Glarb, Calamity's Augur | cEDH | 100% | 1× | 2 |
| Azorius Miracle | Legacy | 100% | 2× | 1 |
| Ishai, Ojutai Dragonspeaker / Jeska, Thrice Reborn | cEDH | 100% | 1× | 1 |
| Nezahal, Primal Tide | cEDH | 100% | 1× | 1 |
| Stiflenought | Legacy | 33.3% | 1× | 3 |
| Izzet Midrange | Legacy | 12.5% | 2× | 16 |
| Azorius Midrange | Legacy | 9.4% | 1–2× | 32 |