Tireless Tracker 
Creature — Human Scout
$0.24 #654 0.27 10.4 years
Landfall — Whenever a land you control enters, 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, put a +1/+1 counter on this creature.
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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.
Lonis, Genetics Expert92%
$5.49↑#11041↓0.50↑2.5 years↓
"Whenever you sacrifice a Clue, put a +1/+1 counter on another target creature you control."
Piper Wright, Publick Reporter89%
$0.33↑#6274↓0.41↑2.5 years↓
"Whenever you sacrifice a Clue, put a +1/+1 counter on target creature you control."
Thorough Investigation88%
$2.45↑#7064↓0.16↓5.1 years↓
"Whenever you sacrifice a Clue, venture into the dungeon."
+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."
Ulvenwald Mysteries86%
$0.11↓#7676↓0.00↓10.4 years
"Whenever you sacrifice a Clue, create a 1/1 white Human Soldier creature token."
Graf Mole82%
$0.03↓#15046↓0.12↓10.4 years
"Whenever you sacrifice a Clue, you gain 3 life."
Bloodbriar80%
$0.04↓#19292↓0.2510.1 years
"Whenever you sacrifice another permanent, put a +1/+1 counter on this creature."
Pirate Peddlers80%
$0.15↓#14840↓0.00↓0.8 years↓
"Whenever you sacrifice another permanent, put a +1/+1 counter on this creature."
Gixian Infiltrator80%
$0.29↑#16768↓0.00↓3.8 years↓
"Whenever you sacrifice another permanent, put a +1/+1 counter on this creature."
Havengul Laboratory // Havengul Mystery80%
$0.82↑#9001↓0.09↓4.9 years↓
"At the beginning of your end step, if you sacrificed three or more Clues this turn, transform Havengul Laboratory."
Briarbridge Patrol80%
$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."
Persuasive Interrogators78%
$0.17↓#12283↓0.242.6 years↓
"Whenever you sacrifice a Clue, target opponent gets two poison counters."
+1 more matching line
Jenny Flint77%
$0.24#15869↓0.44↑2.9 years↓
"Whenever you sacrifice a Clue or Food, put a +1/+1 counter on another target creature you control."
Lonis, Cryptozoologist76%
$0.27↑#5143↓0.255.3 years↓
"Whenever another nontoken creature you control enters, investigate."
Tatyova, Benthic Druid76%
$0.15↓#470↑0.82↑8.4 years↓
"Whenever a land you control enters, you gain 1 life and draw a card."
Seer's Sundial76%
$0.15↓#4406↓0.13↓16.6 years↑
"Whenever a land you control enters, you may pay . If you do, draw a card."
. If you do, draw a card."
Gandalf, Shadow's Foe74%
$22.35↑#18222↓0.00↓0.1 years↓
"Whenever a land you control enters, draw a card and put a +1/+1 counter on this card."
Vinelasher Kudzu74%
$0.34↑#13232↓0.56↑20.9 years↑
"Whenever a land you control enters, put a +1/+1 counter on this creature."
Sazh's Chocobo74%
$1.12↑#3068↓0.371.2 years↓
"Whenever a land you control enters, put a +1/+1 counter on this creature."
Prowling Felidar74%
$0.18↓#14068↓0.67↑5.9 years↓
"Whenever a land you control enters, put a +1/+1 counter on this creature."