Runic Armasaur 
Creature — Dinosaur
$2.05 #2433 0.42 8.1 years
Whenever an opponent activates an ability of a creature or land that isn't a mana ability, you may draw a card.
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Cards similar to Runic Armasaur expected a card that isn't here?
Reports become test cases the matcher is graded against before an update ships. Delvefall isn't a chatbot guessing, it compares the printed rules text of every card with plain math, and examples like yours decide which differences should count.
Wizened Mentor84%
$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."
Verity Circle84%
$0.89↓#4337↓0.28↓7.6 years
"Whenever a creature an opponent controls becomes tapped, if it isn't being declared as an attacker, you may draw a card."
Burning-Tree Shaman76%
$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."
Mercadian Atlas74%
$0.64↓#24763↓0.23↓26.9 years↑
"At the beginning of your end step, if you didn't play a land this turn, you may draw a card."
Well of Discovery74%
$0.42↓#26810↓0.3826.3 years↑
"At the beginning of your end step, if you control no untapped lands, draw a card."
Everett K. Ross, Hapless Attaché73%
$0.26↓#15374↓0.00↓0.2 years↓
"Whenever an opponent attacks you with two or more creatures, draw a card."
Consecrated Sphinx72%
$22.91↑#665↑1.80↑15.6 years↑
"Whenever an opponent draws a card, you may draw two cards."
Harsh Mentor71%
$0.29↓#23940.479.4 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."
Psychic Possession70%
$16.27↑#11202↓0.4420.3 years↑
"Whenever enchanted opponent draws a card, you may draw a card."
Ever-Watching Threshold70%
$0.25↓#8812↓0.388.1 years
"Whenever an opponent attacks, if they attacked you and/or a planeswalker you control, draw a card."
Shapers' Sanctuary70%
$0.81↓#11901↓0.17↓8.9 years
"Whenever a creature you control becomes the target of a spell or ability an opponent controls, you may draw a card."
Windreader Sphinx70%
$0.23↓#7551↓0.3613.1 years↑
"Whenever a creature with flying attacks, you may draw a card."
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."