Knowledge Seeker 

Creature — Fox Spirit
$0.20 #15820 0.19 0.9 years
Vigilance
Whenever you draw your second card each turn, put a +1/+1 counter on this creature.
When this creature dies, create a Clue token. (It's an artifact with "
, Sacrifice this token: Draw a card.")
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Cards similar to Knowledge Seeker 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.
Atlantean Cavalry98%
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"Whenever you draw your second card each turn, put a +1/+1 counter on this creature."
+1 more matching line
Lakeshore Apothecary98%
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"Whenever you draw your second card each turn, put a +1/+1 counter on this creature."
+1 more matching line
Faerie Vandal98%
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"Whenever you draw your second card each turn, put a +1/+1 counter on this creature."
Erudite Wizard98%
$0.15↓#148980.00↓1.9 years↑
"Whenever you draw your second card each turn, put a +1/+1 counter on this creature."
Knights of Dol Amroth98%
$0.13↓#134850.00↓3.3 years↑
"Whenever you draw your second card each turn, put a +1/+1 counter on this creature."
Lat-Nam Adept98%
$0.06↓#21341↓0.06↓3.9 years↑
"Whenever you draw your second card each turn, put a +1/+1 counter on this creature."
Thopter Mechanic96%
$0.13↓#168080.07↓3.9 years↑
"Whenever you draw your second card each turn, put a +1/+1 counter on this creature."
+1 more matching line
Gurgling Anointer94%
$0.12↓#145220.123.9 years↑
"Whenever you draw your second card each turn, put a +1/+1 counter on this creature."
Blue Marvel, Adam Brashear91%
$0.28↑#24300↓0.220.3 years
"Whenever you draw your second card each turn, put a +1/+1 counter on this card."
Morska, Undersea Sleuth90%
$0.21↑#8992↑0.36↑2.7 years↑
"Whenever you draw your second card each turn, put two +1/+1 counters on this card."
Steelgaze Griffin90%
$0.06↓#29841↓0.00↓7.0 years↑
"Whenever you draw your second card each turn, this creature gets +2/+0 until end of turn."
Messenger Hawk87%
$0.08↓#24297↓0.100.9 years
"When this creature enters, create a Clue token."
+1 more matching line
Stalwarts of Osgiliath87%
$0.16↓#178590.00↓3.3 years↑
"Whenever you draw your second card each turn, put a +1/+1 counter on this creature."
Krang, the All-Powerful87%
$0.38↑#6868↑0.60↑0.6 years
"Whenever a player draws their second card each turn, put a +1/+1 counter on this card."
Kid Loki86%
$0.35↑#9579↑0.130.3 years
"Whenever you draw your second card each turn, put a +1/+1 counter on this card."
Roxxon Brutes85%
$0.11↓#20225↓0.09↓0.3 years
"Whenever you draw your second card each turn, put a +1/+1 counter on target creature."
Loxodon Eavesdropper85%
$0.10↓#24553↓0.00↓2.7 years↑
"Whenever you draw your second card each turn, this creature gets +1/+1 and gains vigilance until end of turn."
Prince Imrahil the Fair84%
$0.20#3405↑0.143.3 years↑
"Whenever you draw your second card each turn, create a 1/1 white Human Soldier creature token."
Lorescale Coatl84%
$0.15↓#11755↑0.06↓17.5 years↑
"Whenever you draw a card, put a +1/+1 counter on this creature."