Thornmantle Striker 
Creature — Elf Rogue
$0.21 #22807 0.06 5.7 years
When this creature enters, choose one —
• Remove X counters from target permanent, where X is the number of Elves you control.
• Target creature an opponent controls gets -X/-X until end of turn, where X is the number of Elves you control.
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Cards similar to Thornmantle Striker 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.
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, Discard an Elf card: Target creature gets -X/-X until end of turn, where X is the number of Elves you control."
, Discard an Elf card: Target creature gets -X/-X until end of turn, where X is the number of Elves you control."
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+1 more matching line
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"Choose one or more —"
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"When this creature enters, target creature you control gets +X/+0 until end of turn and up to one target creature an opponent controls gets -0/-X until end of turn, where X is the number of Elves you control plus the number of Elf cards in your graveyard."
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"When this creature enters, choose one —"
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"Choose one —"