Changeling Berserker 
Creature — Shapeshifter
$0.26 #13480 0.07 18.9 years
Changeling (This card is every creature type.)
Haste
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.)
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Cards similar to Changeling Berserker 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 Titan100%
$0.36↑#153830.20↑18.9 years
"Champion a creature"
+1 more matching line
Changeling Hero98%
$0.24↓#16993↓0.0018.9 years
"Champion a creature"
+1 more matching line
Iron-Barb Hellion84%
$0.06↓#31309↓0.62↑22.3 years↑
"Haste"
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$0.16↓#31878↓0.22↑25.9 years↑
"Haste"
Plumeveil77%
$0.11↓#22778↓0.28↑18.3 years
"Flash"
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$0.17↓#29162↓0.0027.9 years↑
"Haste"
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$0.06↓#28469↓0.1627.2 years↑
"Haste"
Aang's Iceberg74%
$0.50↑#6606↑0.000.8 years↓
"Flash"
Supreme Exemplar74%
$0.44↑#24003↓0.0718.6 years
"Champion an Elemental"
Glitterfang74%
$0.25↓#20719↓0.25↑21.3 years↑
"Haste"
Viashino Sandscout74%
$0.08↓#26022↓0.0027.6 years↑
"Haste"
Wormfang Newt72%
$0.15↓#23916↓0.22↑24.3 years↑
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
Wormfang Turtle72%
$0.18↓#24161↓0.0024.3 years↑
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
Wormfang Drake72%
$0.12↓#23561↓0.0024.3 years↑
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
Boggart Mob72%
$4.10↑#143060.23↑18.9 years
"Champion a Goblin"
Lava Hounds72%
$0.11↓#29934↓0.0029.2 years↑
"Haste"
Arc Runner71%
$0.12↓#16673↓0.0016.1 years↓
"Haste"
Ball Lightning71%
$0.36↑#8725↑0.0632.1 years↑
"Haste"
Mistbind Clique70%
$3.59↑#10220↑0.65↑18.9 years
"Champion a Faerie"
Goblin Guide70%
$0.34↑#148770.0716.9 years↓
"Haste"