Swindler's Scheme 
Enchantment
$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.
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Cards similar to Swindler's Scheme expected a card that isn't here?
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Counterbalance86%
$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."
Ice Cave84%
$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."
Planar Chaos78%
$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 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.""
Chancellor of the Annex75%
$2.86↑#10169↑0.80↑15.3 years↑
"Whenever an opponent casts a spell, counter it unless that player pays 
."
."
Decree of Silence75%
$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."
Lunar Force74%
$0.25↑#211160.2210.1 years↑
"When an opponent casts a spell, sacrifice this enchantment and counter that spell."
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."
Presence of the Master70%
$0.46↑#261101.27↑32.3 years↑
"Whenever a player casts an enchantment spell, counter it."
Lavinia, Azorius Renegade70%
$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."
Boromir, Warden of the Tower70%
$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."
Vexing Bauble70%
$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."