Bloodline Pretender 
Artifact Creature — Shapeshifter
$1.55 #1854 0.18 5.6 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.
Venomous Changeling94%
$0.15↓#10580↓0.50↑7.2 years↑
"Changeling"
Mischievous Sneakling94%
$0.25↓#13871↓0.00↓0.6 years↓
"Changeling"
Universal Automaton94%
$0.60↓#21150.127.2 years↑
"Changeling"
Impostor of the Sixth Pride94%
$0.16↓#9881↓0.00↓7.2 years↑
"Changeling"
Chitinous Graspling94%
$0.13↓#20354↓0.00↓0.6 years↓
"Changeling"
Gangly Stompling94%
$0.24↓#15462↓0.00↓0.6 years↓
"Changeling"
Realmwalker92%
$1.72↑#606↑0.31↑5.6 years
"As this creature enters, choose a creature type."
+1 more matching line
Guardian Gladewalker92%
$0.16↓#8168↓0.00↓5.6 years
"Changeling"
Prideful Feastling92%
$0.19↓#17383↓0.00↓0.6 years↓
"Changeling"
Irregular Cohort90%
$0.15↓#5395↓0.157.2 years↑
"Changeling"
Three Tree Mascot89%
$0.15↓#4163↓0.252.1 years↓
"Changeling"
Feisty Spikeling89%
$0.15↓#15949↓0.00↓0.6 years↓
"Changeling"
Graveshifter89%
$0.17↓#2833↓0.107.2 years↑
"Changeling"
Flock Impostor88%
$0.26↓#11193↓0.00↓0.6 years↓
"Changeling"
Morophon, the Boundless88%
$8.27↑#15580.67↑7.2 years↑
"As this card enters, choose a creature type."
+1 more matching line
Mistwalker88%
$0.13↓#13847↓0.195.6 years
"Changeling"
Changeling Outcast88%
$1.66↑#671↑0.247.2 years↑
"Changeling"
Littjara Glade-Warden88%
$0.16↓#18824↓0.085.6 years
"Changeling"
Rooftop Percher88%
$0.22↓#14686↓0.00↓0.6 years↓
"Changeling"
Littjara Kinseekers88%
$0.15↓#16723↓0.275.6 years
"Changeling"
+1 more matching line