相殺 (Counterbalance) (ja)
Enchantment (CMC 2)
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.
Decks with Counterbalance
[PLIST] The List #1248 (U)
[MP2] Amonkhet Invocations #9 (M)
[CSP] Coldsnap #31 (U)
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[MB2] Mystery Booster 2 #157 (U)
[SLD] Secret Lair Drop #1220 (R)