Silent Hallcreeper {1}{U}
Enchantment Creature — Horror
This creature can't be blocked.
Whenever this creature deals combat damage to a player, choose one that hasn't been chosen —
• Put two +1/+1 counters on this creature.
• Draw a card.
• This creature becomes a copy of another target creature you control.
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Cards that do something similar 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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+1 more matching line
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Jin Sakai, Ghost of Tsushima 83%
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Territorial Kavu 82%
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"Whenever this creature attacks, choose one —"
+1 more matching line