Deepfathom Skulker 

Creature — Eldrazi
$0.32 #6920 0.17 10.6 years
Devoid (This card has no color.)
Whenever a creature you control deals combat damage to a player, you may draw a card.
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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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"
,
: Target creature can't be blocked this turn."