Changeling Berserker 
Creature — Shapeshifter
$0.25 #13749 0.00 19.0 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%
$0.31↑#156450.0519.0 years
"Champion a creature"
+1 more matching line
Changeling Hero98%
$0.24↓#17330↓0.14↑19.0 years
"Champion a creature"
+1 more matching line
Iron-Barb Hellion84%
$0.06↓#31554↓0.0022.4 years↑
"Haste"
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$0.15↓#32200↓0.0026.0 years↑
"Haste"
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$0.14↓#29434↓0.0528.0 years↑
"Haste"
Supreme Exemplar74%
$0.43↑#24330↓0.0018.7 years
"Champion an Elemental"
Viashino Sandscout74%
$0.08↓#26446↓0.0727.7 years↑
"Haste"
Glitterfang74%
$0.22↓#21013↓0.0021.4 years↑
"Haste"
Keldon Champion74%
$0.05↓#28781↓0.0027.4 years↑
"Haste"
Wormfang Turtle72%
$0.18↓#24151↓0.11↑24.4 years↑
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
Wormfang Drake72%
$0.13↓#23898↓0.0524.4 years↑
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
Wormfang Newt72%
$0.17↓#23786↓0.0024.4 years↑
"When this creature leaves the battlefield, return the exiled card to the battlefield under its owner's control."
Lava Hounds72%
$0.10↓#30342↓0.0029.4 years↑
"Haste"
Boggart Mob71%
$4.10↑#145310.0019.0 years
"Champion a Goblin"
Ball Lightning71%
$0.42↑#8677↑0.0732.2 years↑
"Haste"
Arc Runner71%
$0.11↓#16866↓0.0716.3 years↓
"Haste"
Mistbind Clique70%
$2.99↑#10320↑0.53↑19.0 years
"Champion a Faerie"
Goblin Guide70%
$0.33↑#151090.21↑17.0 years↓
"Haste"
Crocodile of the Crossing70%
$0.08↓#26332↓0.009.5 years↓
"Haste"