Servant of the Stinger 
Creature — Human Warlock
$0.19 #10489 0.06 2.5 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.
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"Solved — , Sacrifice this Case: Search your library for a card, put it into your hand, then shuffle. Activate only as a sorcery."
, Sacrifice this Case: Search your library for a card, put it into your hand, then shuffle. Activate only as a sorcery."
Rune-Scarred Demon74%
$1.20↑#1308↑0.43↑15.3 years↑
"When this creature enters, search your library for a card, put it into your hand, then shuffle."
Ayara's Oathsworn74%
$0.30↑#7396↑0.073.4 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."
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$10.24↑#2855↑0.44↑11.6 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
Diabolic Tutor74%
$1.18↑#486↑0.47↑25.1 years↑
"Search your library for a card, put that card into your hand, then shuffle."
Demonic Tutor74%
$61.82↑#64↑1.61↑33.2 years↑
"Search your library for a card, put that card into your hand, then shuffle."
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"Deathtouch"
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"Deathtouch"
Hour of Victory70%
$0.24↑#13404↓0.41↑1.7 years
"Max speed — , Sacrifice this enchantment: Search your library for a card, put it into your hand, then shuffle. Activate only as a sorcery."
, Sacrifice this enchantment: Search your library for a card, put it into your hand, then shuffle. Activate only as a sorcery."
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"Deathtouch"