Cavalry Master 
Creature — Human Knight
$0.15 #26794 0.22 19.9 years
Flanking (Whenever a creature without flanking blocks this creature, the blocking creature gets -1/-1 until end of turn.)
Other creatures you control with flanking have flanking. (Each instance of flanking triggers separately.)
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Cards similar to Cavalry Master 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.
Jabari's Banner82%
$0.23↑#271620.2029.2 years↑
"
, 
: Target creature gains flanking until end of turn."
, : Target creature gains flanking until end of turn."
Agility81%
$0.21↑#243340.10↓29.9 years↑
"Enchanted creature gets +1/+1 and has flanking."
Sidewinder Sliver79%
$0.27↑#12121↑0.44↑19.9 years
"All Sliver creatures have flanking."
Telim'Tor76%
$0.85↑#293000.05↓29.9 years↑
"Whenever this card attacks, all attacking creatures with flanking get +1/+1 until end of turn."
+1 more matching line
Retaliation70%
$0.14↓#244080.57↑27.9 years↑
"Creatures you control have "Whenever this creature becomes blocked by a creature, this creature gets +1/+1 until end of turn.""