Biblioplex Tomekeeper 
Artifact Creature — Construct
$0.22 #18832 0.10 0.5 years
When this creature enters, choose up to one —
• Target creature becomes prepared. (Only creatures with prepare spells can become prepared.)
• Target creature becomes unprepared.
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Cards similar to Biblioplex Tomekeeper 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.
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"
, 
: Target creature becomes prepared."
, : Target creature becomes prepared."
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$0.10↓#31092↓0.00↓15.4 years↑
"When this creature enters, choose one —"
+2 more matching lines
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", : Target creature becomes prepared."
, : Target creature becomes prepared."+1 more matching line
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$0.17↓#211790.00↓15.4 years↑
"When this creature enters, choose one —"
Gearbane Orangutan79%
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"When this creature enters, choose one —"
Skemfar Shadowsage78%
$0.29↑#4589↑0.095.7 years↑
"When this creature enters, choose one —"
Glamermite78%
$0.21↓#13101↑0.080.7 years
"When this creature enters, choose one —"
+1 more matching line
Divining Duelist78%
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+1 more matching line
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$0.23↑#159080.053.1 years↑
"When this creature enters, choose one or more —"
Shivan Sand-Mage76%
$0.17↓#157150.0619.5 years↑
"When this creature enters, choose one —"
Flash Thompson, Spider-Fan76%
$0.17↓#11653↑0.31↑1.1 years
"When this card enters, choose one or both —"
Deceiver Exarch74%
$0.16↓#13928↑0.1815.4 years↑
"When this creature enters, choose one —"
Giant-Sized Flying Ant74%
$0.10↓#222920.23↑0.3 years
"When this creature enters, choose one —"
Brutalizer Exarch73%
$0.19↓#14694↑0.0615.4 years↑
"When this creature enters, choose one —"
Sawblade Slinger72%
$0.10↓#23120↓0.104.9 years↑
"When this creature enters, choose up to one —"
Energy Bolt72%
$1.10↑#27277↓0.31↑30.0 years↑
"Choose one —"
Live or Die71%
$0.21↓#11013↑0.31↑2.1 years↑
"Choose one —"
+1 more matching line
Feast or Famine71%
$0.10↓#26913↓0.0730.4 years↑
"Choose one —"
You're Confronted by Robbers71%
$0.09↓#163360.134.4 years↑
"Choose one —"
Codie, Ravenous Codex70%
$0.22#170120.34↑0.0 years
"
, : Each creature you control becomes prepared."
, : Each creature you control becomes prepared."