Riders of Gavony 
Creature — Human Knight
$0.28 #12883 0.21 14.5 years
Vigilance
As this creature enters, choose a creature type.
Human creatures you control have protection from creatures of the chosen type.
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Cards similar to Riders of Gavony 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.
Plague Engineer85%
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"As this creature enters, choose a creature type."
Engineered Plague84%
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"As this enchantment enters, choose a creature type."
Species Specialist81%
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"As this creature enters, choose a creature type."
An-Zerrin Ruins80%
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"As this enchantment enters, choose a creature type."
Circle of Solace78%
$0.31↑#27898↓0.44↑24.0 years↑
"As this enchantment enters, choose a creature type."
Steely Resolve77%
$2.13↑#7595↑0.81↑24.0 years↑
"As this enchantment enters, choose a creature type."
+1 more matching line
Spare from Evil76%
$0.20↓#20499↓0.00↓15.1 years
"Creatures you control gain protection from non-Human creatures until end of turn."
Heronblade Elite73%
$2.52↑#4803↑0.215.1 years↓
"Vigilance"
Samite Elder72%
$0.55↑#24038↓0.38↑25.7 years↑
"
: Choose target permanent you control. Creatures you control gain protection from each of that permanent's colors until end of turn."
: Choose target permanent you control. Creatures you control gain protection from each of that permanent's colors until end of turn."
Serra's Emissary72%
$0.81↑#2311↑1.00↑5.5 years↓
"You and creatures you control have protection from the chosen card type."
+1 more matching line
Caller of the Hunt72%
$1.12↑#21782↓0.07↓27.0 years↑
"As an additional cost to cast this spell, choose a creature type."
Guardian of Faith72%
$0.62↑#1926↑0.41↑5.2 years↓
"Vigilance"
Kindred Boon71%
$0.31↑#7393↑0.219.2 years↓
"As this enchantment enters, choose a creature type."
+1 more matching line
Coppercoat Vanguard70%
$0.25↓#4182↑0.163.4 years↓
"Each other Human you control gets +1/+0 and has ward 
."
."
Extinction70%
$0.89↑#21212↓0.72↑29.0 years↑
"Destroy all creatures of the creature type of your choice."
Herald of Dromoka70%
$0.17↓#130500.00↓11.6 years↓
"Vigilance"