Chorus of the Tides 
Creature — Siren
$0.07 #30312 0.25 12.7 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%
$0.17↑#16366↑0.06↓7.5 years↓
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature, then scry 1."
Battlewise Hoplite92%
$0.06↓#257100.00↓13.1 years
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature, then scry 1."
Hawkeye, Bowslinger92%
$0.30↑#24149↑0.190.3 years↓
"Whenever you cast a spell that targets a creature, put a +1/+1 counter on this card. Scry 1."
Colleen Wing, Street Samurai92%
$0.23↑#20121↑0.160.3 years↓
"Whenever you cast a spell that targets a creature you control, put a +1/+1 counter on this card. Scry 1."
Stormchaser Drake87%
$0.32↑#9064↑0.07↓4.9 years↓
"Flying"
Merfolk Falconer86%
$0.06↓#274930.00↓6.1 years↓
"Whenever you cast a kicked spell, scry 2."
Ruin-Lurker Bat85%
$0.37↑#8471↑0.00↓2.9 years↓
"At the beginning of your end step, if you descended this turn, scry 1."
Prescient Chimera85%
$0.11↑#22669↑0.00↓13.1 years
"Whenever you cast an instant or sorcery spell, scry 1."
+1 more matching line
Eyes of the Watcher84%
$0.34↑#22151↑0.00↓22.4 years↑
"Whenever you cast an instant or sorcery spell, you may pay 
. If you do, scry 2."
. If you do, scry 2."
Veteran Guardmouse84%
$0.16↑#13771↑0.222.2 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."
Geist of the Archives84%
$0.17↑#13250↑0.00↓10.2 years↓
"At the beginning of your upkeep, scry 1."
Season of Growth84%
$0.21↑#2248↑0.207.3 years↓
"Whenever a creature you control enters, scry 1."
Poised Practitioner83%
$0.15↑#18935↑0.331.5 years↓
"Whenever you cast your second spell each turn, put a +1/+1 counter on this creature. Scry 1."
Artificer's Assistant83%
$0.25↑#5266↑0.338.5 years↓
"Whenever you cast a historic spell, scry 1."
Sigiled Starfish82%
$0.08↑#8060↑0.00↓12.5 years
"
: Scry 1."
: Scry 1."
Oggyar Battle-Seer82%
$0.07#302580.12↓5.5 years↓
": Scry 1."
: Scry 1."
Burning Prophet82%
$0.15↑#12765↑0.07↓7.5 years↓
"Whenever you cast a noncreature spell, this creature gets +1/+0 until end of turn, then scry 1."
Iron-Fist Pulverizer81%
$0.08↑#20348↑0.06↓2.5 years↓
"Whenever you cast your second spell each turn, this creature deals 2 damage to target opponent. Scry 1."
Crystal Ball81%
$0.44↑#7016↑0.00↓16.3 years↑
", : Scry 2."
, : Scry 2."
Fin Fang Foom81%
$0.25↑#19913↑0.60↑0.3 years↓
"Flying"