Counterbalance 
Enchantment
$2.58 #3290 1.01 20.1 years
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.
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Cards similar to Counterbalance expected a card that isn't here?
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Swindler's Scheme86%
$0.16↓#23086↓0.21↓4.4 years↓
"Whenever an opponent casts a spell from their hand, you may reveal the top card of your library. If it shares a card type with that spell, counter that spell and that opponent may cast the revealed card without paying its mana cost."
Chalice of the Void84%
$16.39↑#9268↓1.14↑22.9 years↑
"Whenever a player casts a spell with mana value equal to the number of charge counters on this artifact, counter that spell."
Ice Cave84%
$0.77↓#21126↓0.9225.3 years↑
"Whenever a player casts a spell, any other player may pay that spell's mana cost. If a player does, counter the spell."
Planar Chaos79%
$2.31↓#7147↓1.41↑24.3 years↑
"Whenever a player casts a spell, that player flips a coin. If they lose the flip, counter that spell."
Jace, Unraveler of Secrets78%
$1.37↓#6632↓0.73↓10.4 years↓
"−8: You get an emblem with "Whenever an opponent casts their first spell each turn, counter that spell.""
Lunar Force78%
$0.25↓#21116↓0.22↓10.1 years↓
"When an opponent casts a spell, sacrifice this enchantment and counter that spell."
Decree of Silence78%
$29.75↑#11514↓1.15↑23.3 years↑
"Whenever an opponent casts a spell, counter that spell and put a depletion counter on this enchantment. If there are three or more depletion counters on this enchantment, sacrifice it."
Chancellor of the Annex76%
$2.86↑#10169↓0.80↓15.3 years↓
"Whenever an opponent casts a spell, counter it unless that player pays 
."
."
Lavinia, Azorius Renegade74%
$0.18↓#31830.917.6 years↓
"Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell."
Boromir, Warden of the Tower74%
$6.61↑#851↑0.60↓3.2 years↓
"Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell."
In the Eye of Chaos74%
$193.45↑#21265↓1.30↑32.3 years↑
"Whenever a player casts an instant spell, counter it unless that player pays 
, where X is its mana value."
, where X is its mana value."
Vexing Bauble74%
$2.17↓#1304↑0.51↓2.2 years↓
"Whenever a player casts a spell, if no mana was spent to cast it, counter that spell."
Presence of the Master72%
$0.46↓#26110↓1.27↑32.3 years↑
"Whenever a player casts an enchantment spell, counter it."
Nether Void70%
$519.01↑#16171↓2.23↑32.3 years↑
"Whenever a player casts a spell, counter it unless that player pays 
."
."
Void Mirror70%
$0.37↓#15611↓1.005.3 years↓
"Whenever a player casts a spell, if no colored mana was spent to cast it, counter that spell."