Servant of the Stinger 

Creature — Human Warlock
$0.19 #10318 0.36 2.4 years
Deathtouch
Whenever this creature deals combat damage to a player, if you've committed a crime this turn, you may sacrifice this creature. If you do, search your library for a card, put it into your hand, then shuffle. (Targeting opponents, anything they control, and/or cards in their graveyards is a crime.)
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Cards similar to Servant of the Stinger 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.
Case of the Stashed Skeleton74%
$0.34↑#6707↑0.13↓2.6 years
"Solved — 
, Sacrifice this Case: Search your library for a card, put it into your hand, then shuffle. Activate only as a sorcery."
Rune-Scarred Demon74%
$0.80↑#1293↑0.54↑15.1 years↑
"When this creature enters, search your library for a card, put it into your hand, then shuffle."
Ayara's Oathsworn74%
$0.38↑#7213↑0.50↑3.3 years
"Whenever this creature deals combat damage to a player, if it has fewer than four +1/+1 counters on it, put a +1/+1 counter on it. Then if it has exactly four +1/+1 counters on it, search your library for a card, put it into your hand, then shuffle."
Sidisi, Undead Vizier74%
$8.71↑#2797↑0.3511.4 years↑
"When this card exploits a creature, you may search your library for a card, put it into your hand, then shuffle."
+1 more matching line
Demonic Tutor74%
$58.70↑#62↑1.58↑33.1 years↑
"Search your library for a card, put that card into your hand, then shuffle."
Diabolic Tutor74%
$1.10↑#481↑0.50↑24.9 years↑
"Search your library for a card, put that card into your hand, then shuffle."
Hour of Victory70%
$0.27↑#13467↓0.21↓1.6 years
"Max speed — 
, Sacrifice this enchantment: Search your library for a card, put it into your hand, then shuffle. Activate only as a sorcery."
Diabolic Intent70%
$15.95↑#271↑0.74↑25.6 years↑
"Search your library for a card, put that card into your hand, then shuffle."