Spellshock 
Enchantment
$2.89 #5624 0.80 28.3 years
Whenever a player casts a spell, this enchantment deals 2 damage to that player.
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Cards similar to Spellshock expected a card that isn't here?
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Pyrostatic Pillar95%
$2.74↓#12463↓0.36↓23.4 years↓
"Whenever a player casts a spell with mana value 3 or less, this enchantment deals 2 damage to that player."
Aether Sting92%
$0.43↓#15402↓0.00↓27.4 years
"Whenever an opponent casts a creature spell, this enchantment deals 1 damage to that player."
Eidolon of the Great Revel88%
$2.22↓#8389↓0.56↓12.5 years↓
"Whenever a player casts a spell with mana value 3 or less, this creature deals 2 damage to that player."
Mondronen Shaman // Tovolar's Magehunter86%
$0.54↓#14427↓0.12↓14.7 years↓
"Whenever an opponent casts a spell, this creature deals 2 damage to that player."
Manabarbs84%
$4.42↑#2300↑1.34↑33.2 years↑
"Whenever a player taps a land for mana, this enchantment deals 1 damage to that player."
Sulfuric Vortex84%
$0.86↓#2865↑0.7123.4 years↓
"At the beginning of each player's upkeep, this enchantment deals 2 damage to that player."
Scytheclaw Raptor82%
$0.28↓#3236↑0.39↓2.9 years↓
"Whenever a player casts a spell, if it's not their turn, this creature deals 4 damage to them."
Hearthborn Battler81%
$0.27↓#7170↓0.12↓2.2 years↓
"Whenever a player casts their second spell each turn, this creature deals 2 damage to target opponent."
Dingus Egg80%
$0.47↓#15739↓0.18↓33.2 years↑
"Whenever a land is put into a graveyard from the battlefield, this artifact deals 2 damage to that land's controller."
Copper Tablet80%
$56.19↑#15887↓0.25↓33.2 years↑
"At the beginning of each player's upkeep, this artifact deals 1 damage to that player."
Roiling Vortex80%
$1.36↓#2588↑0.54↓6.1 years↓
"Whenever a player casts a spell, if no mana was spent to cast that spell, this enchantment deals 5 damage to that player."
Lasting Tarfire80%
$0.24↓#61990.14↓0.7 years↓
"At the beginning of each end step, if you put a counter on a creature this turn, this enchantment deals 2 damage to each opponent."
Panicked Altisaur80%
$0.16↓#14077↓0.33↓2.9 years↓
"
: This creature deals 2 damage to each opponent."
: This creature deals 2 damage to each opponent."
Soul Barrier78%
$0.27↓#18032↓0.8831.4 years↑
"Whenever an opponent casts a creature spell, this enchantment deals 2 damage to that player unless they pay ."
."
Dwarven Shrine78%
$0.40↓#31705↓0.15↓25.1 years↓
"Whenever a player casts a spell, this enchantment deals X damage to that player, where X is twice the number of cards in all graveyards with the same name as that spell."
Impatience77%
$0.29↓#23159↓0.25↓27.4 years
"At the beginning of each player's end step, if that player didn't cast a spell this turn, this enchantment deals 2 damage to that player."
Zhur-Taa Druid76%
$0.19↓#4257↑0.15↓13.5 years↓
"Whenever you tap this creature for mana, it deals 1 damage to each opponent."
Overabundance76%
$5.67↑#10117↓0.59↓26.0 years↓
"Whenever a player taps a land for mana, that player adds one mana of any type that land produced, and this enchantment deals 1 damage to the player."
Ruric Thar, the Unbowed76%
$0.46↓#47601.07↑13.5 years↓
"Whenever a player casts a noncreature spell, this card deals 6 damage to that player."
Underworld Dreams76%
$1.77↓#1489↑0.7232.4 years↑
"Whenever an opponent draws a card, this enchantment deals 1 damage to that player."