Artificer's Assistant 
Creature — Bird
$0.21 #5562 0.00 8.4 years
Flying
Whenever you cast a historic spell, scry 1. (Artifacts, legendaries, and Sagas are historic. To scry 1, look at the top card of your library, then you may put that card on the bottom.)
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Cards similar to Artificer's Assistant 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.
Chorus of the Tides80%
$0.08↓#29999↓0.38↑12.6 years↑
"Whenever you cast a spell that targets this creature, scry 1."
Serra Disciple78%
$0.18↓#23705↓0.008.4 years
"Whenever you cast a historic spell, this creature gets +1/+1 until end of turn."
Burning Prophet78%
$0.13↓#12505↓0.14↑7.3 years↓
"Whenever you cast a noncreature spell, this creature gets +1/+0 until end of turn, then scry 1."
Jhoira, Weatherlight Captain78%
$0.43↑#1070↑0.72↑8.4 years
"Whenever you cast a historic spell, draw a card."
Ruin-Lurker Bat77%
$0.31↑#8329↓0.24↑2.8 years↓
"At the beginning of your end step, if you descended this turn, scry 1."
Prescient Chimera76%
$0.06↓#22689↓0.12↑12.9 years↑
"Whenever you cast an instant or sorcery spell, scry 1."
+1 more matching line
Eyes of the Watcher76%
$0.33↑#22069↓0.25↑22.3 years↑
"Whenever you cast an instant or sorcery spell, you may pay
. If you do, scry 2."
Alistair, the Brigadier75%
$0.26↑#12148↓0.002.9 years↓
"Whenever you cast a historic spell, create a 1/1 white Soldier creature token."
Glider Kids74%
$0.11↓#17094↓0.000.8 years↓
"When this creature enters, scry 1."
+1 more matching line