Keeper of the Lens 
Artifact Creature — Golem
$0.15 #25361 0.24 11.6 years
You may look at face-down creatures you don't control any time.
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Cards similar to Keeper of the Lens 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.
Found Footage95%
$0.17↑#18545↑0.00↓2.1 years↓
"You may look at face-down creatures your opponents control any time."
Lens of Clarity92%
$0.07↓#19448↑0.3312.1 years
"You may look at the top card of your library and at face-down creatures you don't control any time."
Lumbering Laundry92%
$0.10↓#289440.06↓2.7 years↓
"
: Until end of turn, you may look at face-down creatures you don't control any time."
: Until end of turn, you may look at face-down creatures you don't control any time."
Smoke Teller89%
$0.03↓#32158↓0.00↓12.1 years
"
: Look at target face-down creature."
: Look at target face-down creature."
Aven Soulgazer89%
$0.17↑#31863↓0.00↓24.0 years↑
"
: Look at target face-down creature."
: Look at target face-down creature."
Spy Network78%
$0.17↑#13082↑0.3324.0 years↑
"Look at target player's hand, the top card of that player's library, and any face-down creatures they control. Look at the top four cards of your library, then put them back in any order."
Revealing Wind74%
$0.06↓#246210.00↓11.6 years
"Prevent all combat damage that would be dealt this turn. You may look at each face-down creature that's attacking or blocking."