Harsh Mentor 
Creature — Human Cleric
$0.29 #2394 0.47 9.4 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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Immolation Shaman96%
$0.47↑#7359↓0.17↓7.6 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%
$0.22↓#10192↓0.381.2 years↓
"Whenever an opponent activates an ability of an artifact they control, this card deals 1 damage to that player."
Burning-Tree Shaman89%
$0.37↑#22268↓0.3820.6 years↑
"Whenever a player activates an ability that isn't a mana ability, this creature deals 1 damage to that player."
Haunting Wind84%
$16.29↑#25444↓0.67↑32.5 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 Silence84%
$0.34↑#11647↓0.395.4 years↓
"Whenever an opponent activates an ability that isn't a mana ability, this creature deals 1 damage to that player."
Wizened Mentor82%
$0.25↓#7766↓0.24↓1.6 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%
$1.11↑#26812↓0.4432.5 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%
$0.81↑#7778↓0.473.8 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%
$0.14↓#13609↓0.29↓2.6 years↓
"Whenever an opponent sacrifices an artifact, this creature deals 2 damage to them."
Warp Artifact74%
$0.34↑#29008↓0.17↓33.1 years↑
"At the beginning of the upkeep of enchanted artifact's controller, this Aura deals 1 damage to that player."
Magnetic Mine74%
$0.31↑#18155↓0.33↓15.6 years↑
"Whenever another artifact is put into a graveyard from the battlefield, this artifact deals 2 damage to that artifact's controller."
Collector Ouphe72%
$2.20↑#24311.55↑7.2 years↓
"Activated abilities of artifacts can't be activated."
Eidolon of the Great Revel72%
$2.16↑#8236↓0.67↑12.3 years↑
"Whenever a player casts a spell with mana value 3 or less, this creature deals 2 damage to that player."
Runic Armasaur71%
$2.05↑#24330.428.1 years↓
"Whenever an opponent activates an ability of a creature or land that isn't a mana ability, you may draw a card."
Gremlin Infestation70%
$0.06↓#28970↓0.29↓9.6 years
"At the beginning of your end step, this Aura deals 2 damage to enchanted artifact's controller."
Powerleech70%
$19.83↑#21538↓0.06↓32.5 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."