Serene Sleuth 
Creature — Human Detective
$0.17 #20800 0.07 2.7 years
When this creature enters, investigate. (Create a Clue token. It's an artifact with "
, Sacrifice this token: Draw a card.")
, Sacrifice this token: Draw a card.")At the beginning of combat on your turn, investigate for each goaded creature you control. Then each creature you control is no longer goaded.
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Cards similar to Serene Sleuth 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.
The Rani73%
$0.32↑#13524↑0.47↑3.0 years
"Whenever a goaded creature deals combat damage to one of your opponents, investigate."
Lord Jyscal Guado70%
$0.21↑#10371↑0.25↑1.4 years↓
"At the beginning of each end step, if you put a counter on a creature this turn, investigate."
Homicide Investigator70%
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"Whenever one or more nontoken creatures you control die, investigate. This ability triggers only once each turn."