Harsh Mentor 
Creature — Human Cleric
$0.34 #2515 0.47 9.5 years
Whenever an opponent activates an ability of an artifact, creature, or land on the battlefield, if it isn't a mana ability, this creature deals 2 damage to that player.
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Cards similar to Harsh Mentor expected a card that isn't here?
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Immolation Shaman96%
$0.43↑#7735↓0.11↓7.7 years↓
"Whenever an opponent activates an ability of an artifact, creature, or land that isn't a mana ability, this creature deals 1 damage to that player."
Avalanche of Sector 793%
$0.24↓#10047↓0.11↓1.4 years↓
"Whenever an opponent activates an ability of an artifact they control, this card deals 1 damage to that player."
Burning-Tree Shaman89%
$0.31↓#22677↓0.20↓20.7 years↑
"Whenever a player activates an ability that isn't a mana ability, this creature deals 1 damage to that player."
Haunting Wind84%
$15.12↑#25852↓0.5032.6 years↑
"Whenever an artifact becomes tapped or a player activates an artifact's ability without 
in its activation cost, this enchantment deals 1 damage to that artifact's controller."
in its activation cost, this enchantment deals 1 damage to that artifact's controller."
Flamescroll Celebrant // Revel in Silence83%
$0.32↓#11852↓0.33↓5.5 years↓
"Whenever an opponent activates an ability that isn't a mana ability, this creature deals 1 damage to that player."
Wizened Mentor82%
$0.28↓#7655↓0.06↓1.7 years↓
"Whenever an opponent activates an ability of a permanent that isn't a mana ability, you create a 1/1 white Zombie creature token. This ability triggers only once each turn."
Artifact Possession80%
$1.03↑#27170↓0.5032.6 years↑
"Whenever enchanted artifact becomes tapped or a player activates an ability of enchanted artifact without in its activation cost, this Aura deals 2 damage to that artifact's controller."
in its activation cost, this Aura deals 2 damage to that artifact's controller."
Sardian Avenger79%
$0.86↑#7999↓0.07↓3.9 years↓
"Whenever an artifact an opponent controls is put into a graveyard from the battlefield, this creature deals 1 damage to that player."
Vengeful Tracker79%
$0.13↓#13958↓0.06↓2.7 years↓
"Whenever an opponent sacrifices an artifact, this creature deals 2 damage to them."
Magnetic Mine74%
$0.32↓#18516↓0.12↓15.7 years↑
"Whenever another artifact is put into a graveyard from the battlefield, this artifact deals 2 damage to that artifact's controller."
Warp Artifact74%
$0.32↓#29272↓0.12↓33.2 years↑
"At the beginning of the upkeep of enchanted artifact's controller, this Aura deals 1 damage to that player."
Runic Armasaur71%
$2.32↑#24810.28↓8.3 years↓
"Whenever an opponent activates an ability of a creature or land that isn't a mana ability, you may draw a card."
Gremlin Infestation71%
$0.04↓#29340↓0.26↓9.7 years
"At the beginning of your end step, this Aura deals 2 damage to enchanted artifact's controller."
Collector Ouphe71%
$1.92↑#24941.57↑7.4 years↓
"Activated abilities of artifacts can't be activated."
Eidolon of the Great Revel71%
$2.22↑#8389↓0.5612.5 years↑
"Whenever a player casts a spell with mana value 3 or less, this creature deals 2 damage to that player."
Powerleech70%
$20.88↑#21624↓0.33↓32.6 years↑
"Whenever an artifact an opponent controls becomes tapped or an opponent activates an artifact's ability without in its activation cost, you gain 1 life."
in its activation cost, you gain 1 life."