Thorough Investigation 
Enchantment
$2.27 #7219 0.47 5.2 years
Whenever you attack, investigate. (Create a Clue token. It's an artifact with ", Sacrifice this token: Draw a card.")
, 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↓#24559↓0.06↓2.7 years↓
"Whenever you attack with three or more creatures, investigate."
Tireless Tracker88%
$0.24↓#668↑0.25↓10.5 years↑
"Whenever you sacrifice a Clue, put a +1/+1 counter on this creature."
Ulvenwald Mysteries88%
$0.07↓#78960.12↓10.5 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↓#19429↓0.06↓10.5 years↑
"When you sacrifice a Clue, transform this creature."
+1 more matching line
Sophina, Spearsage Deserter87%
$0.37↓#15161↓0.475.0 years
"Whenever this card attacks, investigate once for each nontoken attacking creature."
Havengul Laboratory // Havengul Mystery86%
$0.59↓#9224↓0.23↓5.0 years
"At the beginning of your end step, if you sacrificed three or more Clues this turn, transform this card."
Agent 13, Sharon Carter85%
$0.12↓#20175↓0.22↓0.3 years↓
"Whenever a creature you control attacks alone, investigate."
Briarbridge Patrol84%
$0.17↓#17669↓0.00↓10.5 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."
Graf Mole84%
$0.04↓#15432↓0.16↓10.5 years↑
"Whenever you sacrifice a Clue, you gain 3 life."
Lonis, Genetics Expert84%
$5.39↑#11221↓0.07↓2.7 years↓
"Whenever you sacrifice a Clue, put a +1/+1 counter on another target creature you control."
+1 more matching line
Piper Wright, Publick Reporter82%
$0.35↓#64230.11↓2.6 years↓
"Whenever you sacrifice a Clue, put a +1/+1 counter on target creature you control."
+1 more matching line
Tamiyo's Journal78%
$0.65↓#2582↑0.19↓10.5 years↑
"At the beginning of your upkeep, investigate."
+1 more matching line
Lazav, Wearer of Faces78%
$0.23↓#14091↓0.26↓2.7 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%
$0.25↓#64500.06↓12.3 years↑
"Whenever you attack with two or more creatures, draw a card."
Martha Jones76%
$0.34↓#9300↓0.19↓3.0 years↓
"Whenever you sacrifice a Clue, this card and up to one other target creature can't be blocked this turn."
Persuasive Interrogators76%
$0.19↓#12538↓0.60↑2.7 years↓
"Whenever you sacrifice a Clue, target opponent gets two poison counters."
Sokka, Lateral Strategist75%
$0.19↓#74550.15↓0.9 years↓
"Whenever this card and at least one other creature attack, draw a card."
Bard, Heir of Girion74%
$8.97↑#17684↓0.22↓0.2 years↓
"Whenever you attack, draw a card."
Overwhelming Instinct74%
$0.16↓#13722↓0.06↓24.0 years↑
"Whenever you attack with three or more creatures, draw a card."
Search the Premises74%
$0.25↓#73580.00↓5.5 years
"Whenever a creature attacks you or a planeswalker you control, investigate."