Straw Golem 
Artifact Creature — Golem
$0.15 #30399 0.00 29.4 years
When an opponent casts a creature spell, sacrifice this creature.
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"Whenever an opponent casts a spell, this creature gets +2/+2 until end of turn."
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"Whenever an opponent casts a spell, create a 1/1 green Insect creature token."
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"When an opponent casts a spell, sacrifice this enchantment and counter that spell."
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"Whenever an opponent casts a creature spell, this creature isn't a creature until end of turn."
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"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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"Whenever an opponent casts a spell, that player mills two cards."
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"Whenever a player casts a spell, tap this creature."
Mondronen Shaman // Tovolar's Magehunter74%
$0.54↑#14427↑0.12↑14.7 years↓
"Whenever an opponent casts a spell, this creature deals 2 damage to that player."
Desecration Elemental74%
$5.59↑#11843↑0.56↑22.4 years↓
"Whenever a player casts a spell, sacrifice a creature."
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 
."
."
Solarium Sentry72%
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"Whenever an opponent casts a spell with mana value 2 or less, you gain 2 life."
Isolation Cell71%
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"Whenever an opponent casts a creature spell, that player loses 2 life unless they pay ."
."
Taurean Mauler70%
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"Whenever an opponent casts a spell, you may put a +1/+1 counter on this creature."
Ebon Drake70%
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"Whenever a player casts a spell, you lose 1 life."
Blind Creeper70%
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"Whenever a player casts a spell, this creature gets -1/-1 until end of turn."
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"Whenever an opponent casts a spell, that player sacrifices a permanent of their choice unless they pay ."
."
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Pardic Dragon70%
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"Whenever an opponent casts a spell, if this card is suspended, that player may put a time counter on this card."