Knight of Valor 

Creature — Human Knight
$0.20 #28072 0.41 29.6 years
Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)
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Cards similar to Knight of Valor 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.
Plague Wight94%
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"Whenever this creature becomes blocked, each creature blocking it gets -1/-1 until end of turn."
Rabid Rats90%
$0.18↓#238470.00↓28.5 years↓
"
: Target blocking creature gets -1/-1 until end of turn."
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"Whenever this creature becomes blocked by a creature, the blocking creature gets -1/-1 until end of turn."