Ichneumon Druid 
Creature — Human Druid
$3.47 #28972 0.00 32.4 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%
$0.07↓#20302↑0.0613.3 years↓
"Whenever an opponent casts a white or blue instant or sorcery spell, this creature deals 2 damage to that player."
Aether Sting85%
$0.43↓#15402↑0.0027.4 years↓
"Whenever an opponent casts a creature spell, this enchantment deals 1 damage to that player."
Hidden Gibbons82%
$11.06↑#19381↑0.0027.7 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%
$0.54↓#14427↑0.12↑14.7 years↓
"Whenever an opponent casts a spell, this creature deals 2 damage to that player."
Arasta of the Endless Web80%
$0.22↓#1025↑0.33↑6.7 years↓
"Whenever an opponent casts an instant or sorcery spell, create a 1/2 green Spider creature token with reach."
Mage Hunter78%
$0.13↓#17911↑0.25↑5.5 years↓
"Whenever an opponent casts or copies an instant or sorcery spell, they lose 1 life."
Mogg Sentry78%
$0.32↓#22626↑0.12↑25.7 years↓
"Whenever an opponent casts a spell, this creature gets +2/+2 until end of turn."
Straw Golem76%
$0.15↓#303990.0029.4 years↓
"When an opponent casts a creature spell, sacrifice this creature."
Shadow in the Warp75%
$16.28↑#3603↑0.45↑4.0 years↓
"Whenever an opponent casts their first noncreature spell each turn, this enchantment deals 2 damage to that player."
Scalding Viper // Steam Clean74%
$0.35↓#6791↑0.50↑3.1 years↓
"Whenever an opponent casts a spell with mana value 3 or less, this creature deals 1 damage to that player."
Scab-Clan Berserker74%
$0.27↓#15815↑0.42↑11.3 years↓
"Whenever an opponent casts a noncreature spell, if this creature is renowned, this creature deals 2 damage to that player."
Cindervines73%
$0.31↓#6535↑0.21↑7.7 years↓
"Whenever an opponent casts a noncreature spell, this enchantment deals 1 damage to that player."
March of the World Ooze73%
$2.08↓#4147↑0.41↑1.7 years↓
"Whenever an opponent casts a spell, if it's not their turn, you create a 3/3 green Elephant creature token."
Soul Barrier72%
$0.27↓#18032↑0.88↑31.4 years↓
"Whenever an opponent casts a creature spell, this enchantment deals 2 damage to that player unless they pay 
."
."
Magebane Lizard72%
$0.95↓#5498↑0.31↑2.5 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%
$0.49↓#8367↑0.31↑14.4 years↓
"Whenever an opponent casts a spell, create a 1/1 green Insect creature token."
Spellshock70%
$2.89↓#5624↑0.80↑28.3 years↓
"Whenever a player casts a spell, this enchantment deals 2 damage to that player."