Thorough Investigation 

Enchantment
$2.45 #7064 0.16 5.1 years
Whenever you attack, investigate. (Create a Clue token. It's an artifact with "
, Sacrifice this token: Draw a card.")
Whenever you sacrifice a Clue, venture into the dungeon. (Enter the first room or advance to the next room.)
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Cards similar to Thorough Investigation 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.
Meddling Youths89%
$0.06↓#24141↓0.44↑2.6 years↓
"Whenever you attack with three or more creatures, investigate."
Tireless Tracker88%
$0.24↓#654↑0.27↑10.4 years↑
"Whenever you sacrifice a Clue, put a +1/+1 counter on this creature."
Ulvenwald Mysteries88%
$0.11↓#76760.00↓10.4 years↑
"Whenever you sacrifice a Clue, create a 1/1 white Human Soldier creature token."
+1 more matching line
Daring Sleuth // Bearer of Overwhelming Truths88%
$0.06↓#19053↓0.40↑10.4 years↑
"When you sacrifice a Clue, transform this creature."
+1 more matching line
Sophina, Spearsage Deserter87%
$0.36↓#14853↓0.074.9 years
"Whenever this card attacks, investigate once for each nontoken attacking creature."
Agent 13, Sharon Carter85%
$0.15↓#21226↓0.00↓0.2 years↓
"Whenever a creature you control attacks alone, investigate."
Briarbridge Patrol84%
$0.18↓#17297↓0.2010.4 years↑
"At the beginning of each end step, if you sacrificed three or more Clues this turn, you may put a creature card from your hand onto the battlefield."
Lonis, Genetics Expert84%
$5.49↑#11041↓0.50↑2.5 years↓
"Whenever you sacrifice a Clue, put a +1/+1 counter on another target creature you control."
+1 more matching line
Havengul Laboratory // Havengul Mystery84%
$0.82↓#9001↓0.094.9 years
"At the beginning of your end step, if you sacrificed three or more Clues this turn, transform Havengul Laboratory."
Piper Wright, Publick Reporter82%
$0.33↓#62740.41↑2.5 years↓
"Whenever you sacrifice a Clue, put a +1/+1 counter on target creature you control."
+1 more matching line
Tamiyo's Journal78%
$0.62↓#2546↑0.2410.4 years↑
"At the beginning of your upkeep, investigate."
+1 more matching line
Lazav, Wearer of Faces78%
$0.23↓#13843↓0.00↓2.6 years↓
"Whenever you sacrifice a Clue, you may have this card become a copy of a creature card exiled with it until end of turn."
+1 more matching line
Military Intelligence76%
$0.27↓#63080.1512.1 years↑
"Whenever you attack with two or more creatures, draw a card."
Martha Jones76%
$0.34↓#9084↓0.50↑2.9 years↓
"Whenever you sacrifice a Clue, this card and up to one other target creature can't be blocked this turn."
Persuasive Interrogators76%
$0.17↓#12283↓0.242.6 years↓
"Whenever you sacrifice a Clue, target opponent gets two poison counters."
Sokka, Lateral Strategist75%
$0.19↓#76000.00↓0.8 years↓
"Whenever this card and at least one other creature attack, draw a card."
Overwhelming Instinct74%
$0.15↓#13601↓0.2523.9 years↑
"Whenever you attack with three or more creatures, draw a card."