Quill-Slinger Boggart 

Creature — Goblin Warrior
$0.13 #31561 0.06 18.9 years
Whenever a player casts a Kithkin spell, you may have target player lose 1 life.
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Cards similar to Quill-Slinger Boggart 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.
Goldmeadow Stalwart74%
$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
."
Mistmeadow Council74%
$0.08↓#21579↑0.000.6 years↓
"This spell costs
less to cast if you control a Kithkin."