Runic Armasaur 
Creature — Dinosaur
$2.32 #2481 0.28 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.
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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%
$0.28↓#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."
Verity Circle84%
$0.94↓#4339↓0.377.7 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%
$0.31↓#22677↓0.2020.7 years↑
"Whenever a player activates an ability that isn't a mana ability, this creature deals 1 damage to that player."
Mercadian Atlas74%
$0.60↓#24887↓0.12↓27.0 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%
$0.41↓#27074↓0.00↓26.4 years↑
"At the beginning of your end step, if you control no untapped lands, draw a card."
Consecrated Sphinx72%
$25.11↑#653↑1.82↑15.7 years↑
"Whenever an opponent draws a card, you may draw two cards."
Everett K. Ross, Hapless Attaché72%
$0.31↓#14213↓0.360.3 years↓
"Whenever an opponent attacks you with two or more creatures, draw a card."
Harsh Mentor71%
$0.34↓#25150.47↑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."
Ever-Watching Threshold70%
$0.24↓#8853↓0.218.2 years
"Whenever an opponent attacks, if they attacked you and/or a planeswalker you control, draw a card."
Psychic Possession70%
$13.90↑#11428↓0.64↑20.5 years↑
"Whenever enchanted opponent draws a card, you may draw a card."
Shapers' Sanctuary70%
$0.58↓#12069↓0.40↑9.1 years
"Whenever a creature you control becomes the target of a spell or ability an opponent controls, you may draw a card."
Windreader Sphinx70%
$0.24↓#6648↓0.06↓13.3 years↑
"Whenever a creature with flying attacks, you may draw a card."
Powerleech70%
$20.88↑#21624↓0.3332.6 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."