Mogg Sentry 
Creature — Goblin Warrior
$0.33 #22304 0.00 25.6 years
Whenever an opponent casts a spell, this creature gets +2/+2 until end of turn.
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Cards similar to Mogg Sentry expected a card that isn't here?
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Taurean Mauler80%
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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, that player mills two cards."
Ichneumon Druid78%
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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."
Weeping Angel76%
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"Whenever an opponent casts a creature spell, this creature isn't a creature until end of turn."
Citanul Druid76%
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"Whenever an opponent casts an artifact spell, put a +1/+1 counter on this creature."
Forced Fruition76%
$3.09↑#2511↑0.97↑18.9 years↓
"Whenever an opponent casts a spell, that player draws seven cards."
Sunscorch Regent76%
$0.30↓#1686↑0.29↑11.4 years↓
"Whenever an opponent casts a spell, put a +1/+1 counter on this creature and you gain 1 life."
Mondronen Shaman // Tovolar's Magehunter76%
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"Whenever an opponent casts a spell, this creature deals 2 damage to that player."
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"Whenever an opponent casts a spell, put a +1/+1 counter on this card."
Eyes of the Wisent74%
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"Whenever an opponent casts a blue spell during your turn, you may create a 4/4 green Elemental creature token."
Rewards of Diversity72%
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"Whenever an opponent casts a multicolored spell, you gain 4 life."
Soldier of the Pantheon72%
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"Whenever an opponent casts a multicolored spell, you gain 1 life."
Pardic Dragon72%
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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."
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Hunting Grounds71%
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"As long as there are seven or more cards in your graveyard, this enchantment has "Whenever an opponent casts a spell, you may put a creature card from your hand onto the battlefield.""
Hidden Gibbons71%
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"When an opponent casts an instant spell, if this permanent is an enchantment, it becomes a 4/4 Ape creature."
Lunar Force71%
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"When an opponent casts a spell, sacrifice this enchantment and counter that spell."