Bloodline Pretender 
Artifact Creature — Shapeshifter
$1.20 #1906 0.22 5.7 years
Changeling (This card is every creature type.)
As this creature enters, choose a creature type.
Whenever another creature you control of the chosen type enters, put a +1/+1 counter on this creature.
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Cards similar to Bloodline Pretender 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.
Guardian Gladewalker94%
$0.09↓#8358↓0.00↓5.7 years
"Changeling"
Universal Automaton94%
$0.61↓#21500.12↓7.4 years↑
"Changeling"
Chitinous Graspling94%
$0.13↓#20249↓0.01↓0.7 years↓
"Changeling"
Gangly Stompling94%
$0.19↓#15199↓0.170.7 years↓
"Changeling"
Mischievous Sneakling94%
$0.21↓#13391↓0.07↓0.7 years↓
"Changeling"
Venomous Changeling94%
$0.18↓#10804↓0.06↓7.4 years↑
"Changeling"
Impostor of the Sixth Pride94%
$0.18↓#10090↓0.00↓7.4 years↑
"Changeling"
Realmwalker92%
$2.05↑#612↑0.205.7 years
"As this creature enters, choose a creature type."
+1 more matching line
Prideful Feastling92%
$0.17↓#17002↓0.01↓0.7 years↓
"Changeling"
Irregular Cohort90%
$0.19↓#5519↓0.07↓7.4 years↑
"Changeling"
Littjara Glade-Warden90%
$0.16↓#19210↓0.00↓5.7 years
"Changeling"
Feisty Spikeling90%
$0.17↓#15710↓0.03↓0.7 years↓
"Changeling"
Graveshifter89%
$0.18↓#2822↓0.03↓7.4 years↑
"Changeling"
Three Tree Mascot89%
$0.13↓#4271↓0.00↓2.2 years↓
"Changeling"
Flock Impostor88%
$0.25↓#10699↓0.140.7 years↓
"Changeling"
Morophon, the Boundless88%
$7.70↑#15930.67↑7.4 years↑
"As this card enters, choose a creature type."
+1 more matching line
Rooftop Percher88%
$0.19↓#14342↓0.01↓0.7 years↓
"Changeling"
Changeling Outcast88%
$1.54↑#689↑0.237.4 years↑
"Changeling"
Mistwalker88%
$0.12↓#14050↓0.275.7 years
"Changeling"
Changeling Wayfinder88%
$0.29↓#4497↓0.04↓0.7 years↓
"Changeling"