Changeling Hero 
Creature — Shapeshifter
$0.24 #16993 0.00 18.9 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%
$0.36↑#153830.20↑18.9 years
"Champion a creature"
+1 more matching line
Changeling Berserker98%
$0.26↑#13480↑0.0718.9 years
"Champion a creature"
+1 more matching line
Cursed Courtier90%
$0.11↓#25945↓0.50↑3.0 years↓
"Lifelink"
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$0.03↓#27876↓0.25↑9.1 years↓
"Lifelink"
War Oracle85%
$0.05↓#28567↓0.13↑11.1 years↓
"Lifelink"
Dawnstrike Paladin85%
$0.09↓#25188↓0.0013.1 years↓
"Lifelink"
Daybreak Chaplain85%
$0.05↓#23502↓0.008.1 years↓
"Lifelink"
Yotian Medic85%
$0.12↓#25490↓0.003.8 years↓
"Lifelink"
Champion of Arashin85%
$0.04↓#25638↓0.0011.4 years↓
"Lifelink"
Story Seeker85%
$0.15↓#24326↓0.005.6 years↓
"Lifelink"
Charity Extractor85%
$0.08↓#25448↓0.20↑7.3 years↓
"Lifelink"
Alabaster Host Sanctifier85%
$0.09↓#200790.003.4 years↓
"Lifelink"
Faithbearer Paladin85%
$0.05↓#27364↓0.25↑10.1 years↓
"Lifelink"
Markov Patrician85%
$0.17↓#22658↓0.27↑14.9 years↓
"Lifelink"
Child of Night85%
$0.04↓#145020.50↑17.1 years↓
"Lifelink"
Rhox War Monk85%
$0.07↓#27433↓0.47↑17.9 years
"Lifelink"
Ajani's Sunstriker85%
$0.12↓#141720.25↑14.1 years↓
"Lifelink"
Steadfast Paladin85%
$0.11↓#22006↓0.45↑5.1 years↓
"Lifelink"
Blood Glutton85%
$0.09↓#23696↓0.076.2 years↓
"Lifelink"
Vampire of the Dire Moon85%
$0.45↑#3321↑0.12↑7.2 years↓
"Lifelink"