Ichneumon Druid 
Creature — Human Druid
$3.47 #28538 0.31 32.3 years
Whenever an opponent casts an instant spell other than the first instant spell that player casts each turn, this creature deals 4 damage to that player.
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Mindsparker86%
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"Whenever an opponent casts a white or blue instant or sorcery spell, this creature deals 2 damage to that player."
Aether Sting85%
$0.43↓#14933↑0.12↓27.2 years↓
"Whenever an opponent casts a creature spell, this enchantment deals 1 damage to that player."
Hidden Gibbons82%
$11.67↑#18930↑0.3827.6 years↓
"When an opponent casts an instant spell, if this permanent is an enchantment, it becomes a 4/4 Ape creature."
Mondronen Shaman // Tovolar's Magehunter82%
$0.51↓#14116↑0.21↓14.6 years↓
"Whenever an opponent casts a spell, this creature deals 2 damage to that player."
Arasta of the Endless Web80%
$0.40↓#1017↑0.256.6 years↓
"Whenever an opponent casts an instant or sorcery spell, create a 1/2 green Spider creature token with reach."
Mage Hunter78%
$0.14↓#17506↑0.335.4 years↓
"Whenever an opponent casts or copies an instant or sorcery spell, they lose 1 life."
Mogg Sentry78%
$0.33↓#22304↑0.00↓25.6 years↓
"Whenever an opponent casts a spell, this creature gets +2/+2 until end of turn."
Straw Golem76%
$0.16↓#300110.00↓29.2 years↓
"When an opponent casts a creature spell, sacrifice this creature."
Shadow in the Warp75%
$18.73↑#3477↑0.53↑3.9 years↓
"Whenever an opponent casts their first noncreature spell each turn, this enchantment deals 2 damage to that player."
Scalding Viper // Steam Clean74%
$0.37↓#6619↑0.21↓3.0 years↓
"Whenever an opponent casts a spell with mana value 3 or less, this creature deals 1 damage to that player."
Scab-Clan Berserker74%
$0.31↓#15397↑0.17↓11.1 years↓
"Whenever an opponent casts a noncreature spell, if this creature is renowned, this creature deals 2 damage to that player."
Cindervines73%
$0.33↓#6339↑0.43↑7.6 years↓
"Whenever an opponent casts a noncreature spell, this enchantment deals 1 damage to that player."
March of the World Ooze73%
$1.87↓#4299↑0.311.6 years↓
"Whenever an opponent casts a spell, if it's not their turn, you create a 3/3 green Elephant creature token."
Soul Barrier72%
$0.29↓#17733↑0.55↑31.3 years↓
"Whenever an opponent casts a creature spell, this enchantment deals 2 damage to that player unless they pay 
."
."
Magebane Lizard72%
$1.30↓#5223↑0.262.4 years↓
"Whenever a player casts a noncreature spell, this creature deals damage to that player equal to the number of noncreature spells they've cast this turn."
Dragonlair Spider70%
$0.47↓#8231↑0.10↓14.3 years↓
"Whenever an opponent casts a spell, create a 1/1 green Insect creature token."
Spellshock70%
$2.98↓#5451↑1.33↑28.2 years↓
"Whenever a player casts a spell, this enchantment deals 2 damage to that player."