Mogg Sentry 
Creature — Goblin Warrior
$0.32 #22626 0.12 25.7 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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Dragonlair Spider82%
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"When an opponent casts a creature spell, sacrifice this creature."
Taurean Mauler80%
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"Whenever an opponent casts a spell, you may put a +1/+1 counter on this creature."
Aether Sting79%
$0.43↑#15402↑0.00↓27.4 years↑
"Whenever an opponent casts a creature spell, this enchantment deals 1 damage to that player."
Memory Erosion78%
$7.20↑#3813↑0.44↑18.0 years↓
"Whenever an opponent casts a spell, that player mills two cards."
Ichneumon Druid78%
$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."
Solarium Sentry78%
$0.31↓#190770.150.0 years↓
"Whenever an opponent casts a spell with mana value 2 or less, you gain 2 life."
Citanul Druid77%
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"Whenever an opponent casts an artifact spell, put a +1/+1 counter on this creature."
Sunscorch Regent76%
$0.31↓#1629↑0.36↑11.6 years↓
"Whenever an opponent casts a spell, put a +1/+1 counter on this creature and you gain 1 life."
Weeping Angel76%
$0.37↑#9561↑0.56↑3.0 years↓
"Whenever an opponent casts a creature spell, this creature isn't a creature until end of turn."
Forced Fruition76%
$2.77↑#2525↑0.93↑19.0 years↓
"Whenever an opponent casts a spell, that player draws seven cards."
Mondronen Shaman // Tovolar's Magehunter76%
$0.54↑#14427↑0.1214.7 years↓
"Whenever an opponent casts a spell, this creature deals 2 damage to that player."
Ishai, Ojutai Dragonspeaker76%
$3.68↑#4727↑0.56↑9.9 years↓
"Whenever an opponent casts a spell, put a +1/+1 counter on this card."
Rewards of Diversity72%
$0.43↑#218960.28↑26.0 years
"Whenever an opponent casts a multicolored spell, you gain 4 life."
Soldier of the Pantheon72%
$0.20↓#17211↑0.41↑13.1 years↓
"Whenever an opponent casts a multicolored spell, you gain 1 life."
Pardic Dragon71%
$0.16↓#262420.44↑20.0 years↓
"Whenever an opponent casts a spell, if this card is suspended, that player may put a time counter on this card."
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%
$11.06↑#193810.00↓27.7 years↑
"When an opponent casts an instant spell, if this permanent is an enchantment, it becomes a 4/4 Ape creature."
Lunar Force71%
$0.28↓#214520.35↑10.2 years↓
"When an opponent casts a spell, sacrifice this enchantment and counter that spell."
Monologue Tax71%
$1.47↑#1043↑0.59↑5.5 years↓
"Whenever an opponent casts their second spell each turn, you create a Treasure token."