Lunar Force 
Enchantment
$0.25 #21116 0.22 10.1 years
When an opponent casts a spell, sacrifice this enchantment and counter that spell.
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Cards similar to Lunar Force expected a card that isn't here?
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Hesitation90%
$0.30↑#229670.1328.5 years↑
"When a player casts a spell, sacrifice this enchantment and counter that spell."
Decree of Silence84%
$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."
Ice Cave81%
$0.77↑#211260.92↑25.3 years↑
"Whenever a player casts a spell, any other player may pay that spell's mana cost. If a player does, counter the spell."
Chancellor of the Annex80%
$2.86↑#10169↑0.80↑15.3 years↑
"Whenever an opponent casts a spell, counter it unless that player pays 
."
."
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."
Counterbalance78%
$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."
Straw Golem77%
$0.16↓#30011↓0.00↓29.2 years↑
"When an opponent casts a creature spell, sacrifice this creature."
Jace, Unraveler of Secrets76%
$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.""
Boromir, Warden of the Tower75%
$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."
Swindler's Scheme74%
$0.16↓#230860.214.4 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."
Nether Void74%
$519.01↑#16171↑2.23↑32.3 years↑
"Whenever a player casts a spell, counter it unless that player pays 
."
."
Lavinia, Azorius Renegade74%
$0.18↓#3183↑0.91↑7.6 years↓
"Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell."
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."
Chalice of the Void72%
$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."
Mogg Sentry71%
$0.33↑#223040.00↓25.6 years↑
"Whenever an opponent casts a spell, this creature gets +2/+2 until end of turn."
Void Mirror70%
$0.37↑#15611↑1.00↑5.3 years↓
"Whenever a player casts a spell, if no colored mana was spent to cast it, counter that spell."