Changeling Hero 
Creature — Shapeshifter
$0.24 #17330 0.14 19.0 years
Changeling (This card is every creature type.)
Champion a creature (When this enters, sacrifice it unless you exile another creature you control. When this leaves the battlefield, that card returns to the battlefield.)
Lifelink (Damage dealt by this creature also causes you to gain that much life.)
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Cards similar to Changeling Hero 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.
Changeling Titan98%
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"Champion a creature"
+1 more matching line
Changeling Berserker98%
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"Champion a creature"
+1 more matching line
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$0.13↓#26421↓0.00↓3.1 years↓
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"Lifelink"
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$0.14↓#22222↓0.00↓5.2 years↓
"Lifelink"
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$0.07↓#27779↓0.29↑18.0 years
"Lifelink"
Vampire of the Dire Moon85%
$0.44↑#3310↑0.03↓7.3 years↓
"Lifelink"
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$0.14↓#24441↓0.00↓5.7 years↓
"Lifelink"
Ajani's Sunstriker85%
$0.11↓#142630.36↑14.3 years↓
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Scrounger of Souls85%
$0.05↓#28128↓0.00↓9.3 years↓
"Lifelink"
War Oracle85%
$0.10↓#28918↓0.00↓11.3 years↓
"Lifelink"
Blood Glutton85%
$0.05↓#24057↓0.066.3 years↓
"Lifelink"
Caravan Hurda85%
$0.14↓#29760↓0.00↓17.0 years↓
"Lifelink"
Knight of Meadowgrain85%
$0.24#177090.0619.0 years
"Lifelink"
Mesa Unicorn85%
$0.20↓#145760.178.5 years↓
"Lifelink"
Markov Patrician85%
$0.12↓#22868↓0.2015.1 years↓
"Lifelink"
Daybreak Chaplain85%
$0.04↓#23610↓0.00↓8.3 years↓
"Lifelink"
Child of Night85%
$0.03↓#146780.0517.3 years↓
"Lifelink"
Alabaster Host Sanctifier85%
$0.12↓#203430.00↓3.5 years↓
"Lifelink"
Trained Caracal85%
$0.11↓#153610.00↓14.0 years↓
"Lifelink"