Eyes of the Watcher 

Enchantment
$0.34 #22151 0.00 22.4 years
Whenever you cast an instant or sorcery spell, you may pay
. If you do, scry 2. (Look at the top two cards of your library, then put any number of them on the bottom and the rest on top in any order.)
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Cards similar to Eyes of the Watcher 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.
Prescient Chimera98%
$0.11↓#226690.0013.1 years↓
"Whenever you cast an instant or sorcery spell, scry 1."
Jace's Sanctum94%
$0.57↑#4171↑0.20↑11.3 years↓
"Whenever you cast an instant or sorcery spell, scry 1."
Chorus of the Tides84%
$0.07↓#30312↓0.25↑12.7 years↓
"Whenever you cast a spell that targets this creature, scry 1."
Splashy Spellcaster82%
$0.18↓#226160.003.1 years↓
"Whenever you cast an instant or sorcery spell, create a Sorcerer Role token attached to up to one other target creature you control."
Burning Prophet80%
$0.15↓#12765↑0.077.5 years↓
"Whenever you cast a noncreature spell, this creature gets +1/+0 until end of turn, then scry 1."
Tenth District Legionnaire79%
$0.17↓#16366↑0.067.5 years↓
"Whenever you cast a spell that targets this creature, put a +1/+1 counter on this creature, then scry 1."
Ruin-Lurker Bat79%
$0.37↑#8471↑0.002.9 years↓
"At the beginning of your end step, if you descended this turn, scry 1."
Poised Practitioner78%
$0.15↓#189350.33↑1.5 years↓
"Whenever you cast your second spell each turn, put a +1/+1 counter on this creature. Scry 1."
Fluxcharger78%
$0.15↓#28428↓0.0013.5 years↓
"Whenever you cast an instant or sorcery spell, you may switch this creature's power and toughness until end of turn."
Calculated Dismissal77%
$0.18↓#16394↑0.12↑11.3 years↓
"If there are two or more instant and/or sorcery cards in your graveyard, scry 2."