Planar Chaos 
Enchantment
$2.31 #7147 1.41 24.3 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?
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Ice Cave91%
$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."
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."
Nether Void84%
$519.01↑#16171↓2.23↑32.3 years↑
"Whenever a player casts a spell, counter it unless that player pays 
."
."
Vexing Bauble83%
$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 Master82%
$0.46↓#26110↓1.27↓32.3 years↑
"Whenever a player casts an enchantment spell, counter it."
Hesitation81%
$0.30↓#22967↓0.13↓28.5 years↑
"When a player casts a spell, sacrifice this enchantment and counter that spell."
Chancellor of the Annex81%
$2.86↑#10169↓0.80↓15.3 years↓
"Whenever an opponent casts a spell, counter it unless that player pays 
."
."
Void Mirror80%
$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."
Lunar Force79%
$0.25↓#21116↓0.22↓10.1 years↓
"When an opponent casts a spell, sacrifice this enchantment and counter that spell."
Decree of Silence79%
$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."
Counterbalance79%
$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."
Jace, Unraveler of Secrets78%
$1.37↓#66320.73↓10.4 years↓
"−8: You get an emblem with "Whenever an opponent casts their first spell each turn, counter that spell.""
Bazaar of Wonders78%
$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."
Swindler's Scheme78%
$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."
Lavinia, Azorius Renegade76%
$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 Tower76%
$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."
Cephalid Shrine74%
$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."
Shimmering Glasskite72%
$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."
Jetting Glasskite72%
$0.10↓#30966↓0.20↓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."