Planar Chaos 
Enchantment
$2.33 #7172 1.35 24.4 years
At the beginning of your upkeep, flip a coin. If you lose the flip, sacrifice this enchantment.
Whenever a player casts a spell, that player flips a coin. If they lose the flip, counter that spell.
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Cards similar to Planar Chaos expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Ice Cave91%
$0.74↓#21369↓0.82↓25.4 years
"Whenever a player casts a spell, any other player may pay that spell's mana cost. If a player does, counter the spell."
Chalice of the Void84%
$16.39↑#9424↓1.14↓23.0 years↓
"Whenever a player casts a spell with mana value equal to the number of charge counters on this artifact, counter that spell."
Nether Void84%
$673.40↑#16326↓2.18↑32.4 years↑
"Whenever a player casts a spell, counter it unless that player pays 
."
."
Vexing Bauble83%
$2.98↑#1297↑0.80↓2.3 years↓
"Whenever a player casts a spell, if no mana was spent to cast it, counter that spell."
Presence of the Master82%
$0.55↓#26381↓1.3032.4 years↑
"Whenever a player casts an enchantment spell, counter it."
Hesitation81%
$0.31↓#23370↓0.60↓28.6 years↑
"When a player casts a spell, sacrifice this enchantment and counter that spell."
Chancellor of the Annex81%
$3.18↑#10165↓1.4315.4 years↓
"Whenever an opponent casts a spell, counter it unless that player pays 
."
."
Void Mirror80%
$0.39↓#15623↓0.89↓5.5 years↓
"Whenever a player casts a spell, if no colored mana was spent to cast it, counter that spell."
Lunar Force79%
$0.28↓#21452↓0.35↓10.2 years↓
"When an opponent casts a spell, sacrifice this enchantment and counter that spell."
Decree of Silence79%
$21.71↑#11742↓1.16↓23.4 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."
Counterbalance79%
$2.51↑#3414↑1.00↓20.2 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 Wonders78%
$2.60↑#28491↓0.38↓30.0 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."
Jace, Unraveler of Secrets78%
$2.73↑#59140.41↓10.5 years↓
"−8: You get an emblem with "Whenever an opponent casts their first spell each turn, counter that spell.""
Swindler's Scheme78%
$0.18↓#23391↓0.44↓4.5 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."
Lavinia, Azorius Renegade76%
$0.27↓#3214↑1.10↓7.7 years↓
"Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell."
Boromir, Warden of the Tower76%
$4.45↑#874↑0.64↓3.3 years↓
"Whenever an opponent casts a spell, if no mana was spent to cast it, counter that spell."
In the Eye of Chaos74%
$196.62↑#21499↓1.61↑32.4 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."
Cephalid Shrine74%
$0.36↓#30496↓0.18↓25.1 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."
Jetting Glasskite72%
$0.05↓#31218↓0.19↓21.7 years↓
"Whenever this creature becomes the target of a spell or ability for the first time each turn, counter that spell or ability."
Shimmering Glasskite72%
$0.13↓#30917↓0.06↓21.7 years↓
"Whenever this creature becomes the target of a spell or ability for the first time each turn, counter that spell or ability."