Ice Cave 
Enchantment
$0.77 #21126 0.92 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. (Mana cost includes color.)
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Planar Chaos91%
$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."
Nether Void90%
$519.01↑#16171↑2.23↑32.3 years↑
"Whenever a player casts a spell, counter it unless that player pays ."
."
Chalice of the Void88%
$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."
Vexing Bauble86%
$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."
Void Mirror86%
$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."
Presence of the Master86%
$0.46↓#26110↓1.27↑32.3 years↑
"Whenever a player casts an enchantment spell, counter it."
Chancellor of the Annex84%
$2.86↑#10169↑0.80↓15.3 years↓
"Whenever an opponent casts a spell, counter it unless that player pays 
."
."
Swindler's Scheme84%
$0.16↓#230860.21↓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."
Counterbalance84%
$2.58↑#3290↑1.0120.1 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."
Bazaar of Wonders84%
$2.52↑#28239↓0.50↓29.9 years↑
"Whenever a player casts a spell, counter it if a card with the same name is in a graveyard or a nontoken permanent with the same name is on the battlefield."
Hesitation82%
$0.30↓#229670.13↓28.5 years↑
"When a player casts a spell, sacrifice this enchantment and counter that spell."
Decree of Silence82%
$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."
In the Eye of Chaos82%
$193.45↑#212651.30↑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."
Lunar Force81%
$0.25↓#211160.22↓10.1 years↓
"When an opponent casts a spell, sacrifice this enchantment and counter that spell."
Jace, Unraveler of Secrets80%
$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.""
Cephalid Shrine80%
$0.29↓#30163↓0.44↓24.9 years
"Whenever a player casts a spell, counter that spell unless that player pays , where X is the number of cards in all graveyards with the same name as the spell."
, where X is the number of cards in all graveyards with the same name as the spell."
Boromir, Warden of the Tower78%
$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."
Lavinia, Azorius Renegade78%
$0.18↓#3183↑0.917.6 years↓
"Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell."
Dovescape76%
$5.08↑#12061↑1.21↑20.3 years↓
"Whenever a player casts a noncreature spell, counter that spell. That player creates X 1/1 white and blue Bird creature tokens with flying, where X is the spell's mana value."
Shimmering Glasskite74%
$0.13↓#30656↓0.12↓21.6 years↓
"Whenever this creature becomes the target of a spell or ability for the first time each turn, counter that spell or ability."