Chorus of the Tides 
Creature — Siren
$0.08 #29999 0.38 12.6 years
Flying
Heroic — Whenever you cast a spell that targets this creature, scry 1. (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 Chorus of the Tides 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.
Tenth District Legionnaire95%
$0.19↑#15991↑0.57↑7.3 years↓
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature, then scry 1."
Battlewise Hoplite92%
$0.09↑#256240.11↓12.9 years
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature, then scry 1."
Hawkeye, Bowslinger92%
$0.29↑#251370.00↓0.2 years↓
"Whenever you cast a spell that targets a creature, put a +1/+1 counter on this card. Scry 1."
Colleen Wing, Street Samurai92%
$0.19↑#21184↑0.00↓0.2 years↓
"Whenever you cast a spell that targets a creature you control, put a +1/+1 counter on this card. Scry 1."
Burning Prophet84%
$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."
Merfolk Falconer84%
$0.06↓#272290.00↓5.9 years↓
"Whenever you cast a kicked spell, scry 2."
Veteran Guardmouse83%
$0.14↑#13495↑0.05↓2.1 years↓
"Whenever this creature becomes the target of a spell or ability you control for the first time each turn, it gets +1/+0 and gains first strike until end of turn. Scry 1."
Season of Growth83%
$0.18↑#2197↑0.16↓7.2 years↓
"Whenever a creature you control enters, scry 1."
Prescient Chimera82%
$0.06↓#22689↑0.12↓12.9 years
"Whenever you cast an instant or sorcery spell, scry 1."
+1 more matching line
Storm, Windrider82%
$0.43↑#15449↑0.00↓0.2 years↓
"Flying"
Ruin-Lurker Bat82%
$0.31↑#8329↑0.24↓2.8 years↓
"At the beginning of your end step, if you descended this turn, scry 1."
Lifecrafter's Bestiary82%
$0.34↑#1398↑0.17↓9.6 years↓
"At the beginning of your upkeep, scry 1."
Thaumaturge's Familiar82%
$0.17↑#23171↑0.00↓6.6 years↓
"When this creature enters, scry 1."
Glider Kids82%
$0.11↑#17094↑0.00↓0.8 years↓
"When this creature enters, scry 1."
+1 more matching line
Senate Griffin82%
$0.06↓#292830.00↓7.6 years↓
"When this creature enters, scry 1."
Eyes of the Watcher81%
$0.33↑#22069↑0.25↓22.3 years↑
"Whenever you cast an instant or sorcery spell, you may pay 
. If you do, scry 2."
. If you do, scry 2."
Artificer's Assistant80%
$0.21↑#5562↑0.00↓8.4 years↓
"Whenever you cast a historic spell, scry 1."
Geist of the Archives80%
$0.22↑#13419↑0.24↓10.1 years↓
"At the beginning of your upkeep, scry 1."
Chrome Cat80%
$0.24↑#21891↑0.25↓4.4 years↓
"When this creature enters, scry 1."
Grey Havens Navigator80%
$0.11↑#17703↑0.403.2 years↓
"When this creature enters, scry 1."