Straw Golem 
Artifact Creature — Golem
$0.16 #30011 0.00 29.2 years
When an opponent casts a creature spell, sacrifice this creature.
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Aether Sting82%
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"Whenever an opponent casts a creature spell, this enchantment deals 1 damage to that player."
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"Whenever an opponent casts a spell, this creature gets +2/+2 until end of turn."
Dragonlair Spider78%
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"Whenever an opponent casts a spell, create a 1/1 green Insect creature token."
Lunar Force77%
$0.25↑#21116↑0.22↑10.1 years↓
"When an opponent casts a spell, sacrifice this enchantment and counter that spell."
Weeping Angel76%
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"Whenever an opponent casts a creature spell, this creature isn't a creature until end of turn."
Ichneumon Druid76%
$3.47↑#285380.31↑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."
Memory Erosion76%
$7.21↑#3681↑0.57↑17.9 years↓
"Whenever an opponent casts a spell, that player mills two cards."
Ogre Recluse74%
$0.07↓#319140.0021.6 years↓
"Whenever a player casts a spell, tap this creature."
Mondronen Shaman // Tovolar's Magehunter74%
$0.51↑#14116↑0.21↑14.6 years↓
"Whenever an opponent casts a spell, this creature deals 2 damage to that player."
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 
."
."
Isolation Cell71%
$0.31↑#12534↑0.55↑15.3 years↓
"Whenever an opponent casts a creature spell, that player loses 2 life unless they pay ."
."
Taurean Mauler70%
$0.56↑#947↑0.31↑18.6 years↓
"Whenever an opponent casts a spell, you may put a +1/+1 counter on this creature."
Ebon Drake70%
$1.28↑#10309↑0.50↑22.3 years↓
"Whenever a player casts a spell, you lose 1 life."
Blind Creeper70%
$0.07↓#311480.0022.3 years↓
"Whenever a player casts a spell, this creature gets -1/-1 until end of turn."
Spelltithe Enforcer70%
$7.15↑#8604↑1.16↑20.6 years↓
"Whenever an opponent casts a spell, that player sacrifices a permanent of their choice unless they pay ."
."
Opal Acrolith70%
$0.26↑#304330.29↑27.9 years↓
"Whenever an opponent casts a creature spell, if this permanent is an enchantment, it becomes a 2/4 Soldier creature."
Opal Caryatid70%
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"When an opponent casts a creature spell, if this permanent is an enchantment, it becomes a 2/2 Soldier creature."
Infested Roothold70%
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"Whenever an opponent casts an artifact spell, you may create a 1/1 green Insect creature token."
Pardic Dragon70%
$0.13↓#258580.27↑19.9 years↓
"Whenever an opponent casts a spell, if this card is suspended, that player may put a time counter on this card."
Veiled Apparition70%
$0.18↑#315440.29↑27.9 years↓
"When an opponent casts a spell, if this permanent is an enchantment, it becomes a 3/3 Illusion creature with flying and "At the beginning of your upkeep, sacrifice this creature unless you pay 
.""
.""