Kithkin Harbinger 
Creature — Kithkin Wizard
$0.34 #18641 0.24 18.9 years
When this creature enters, you may search your library for a Kithkin card, reveal it, then shuffle and put that card on top.
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Cards similar to Kithkin Harbinger 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.
Rustic Clachan74%
$0.30↓#211110.10↓18.6 years
"As this land enters, you may reveal a Kithkin card from your hand. If you don't, this land enters tapped."
Mistmeadow Council72%
$0.08↓#215790.00↓0.6 years↓
"This spell costs 
less to cast if you control a Kithkin."
less to cast if you control a Kithkin."
Goldmeadow Stalwart70%
$0.30↓#24709↓0.38↑18.9 years
"As an additional cost to cast this spell, reveal a Kithkin card from your hand or pay 
."
."
Kinsbaile Borderguard70%
$6.36↑#183340.00↓18.6 years
"This creature enters with a +1/+1 counter on it for each other Kithkin you control."