Kemba's Banner {3}{W}
Artifact — Equipment
For Mirrodin! (When this Equipment enters, create a 2/2 red Rebel creature token, then attach this to it.)
Equipped creature gets +1/+1 for each creature you control.
Equip {2}{W}
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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.
Horn of Valhalla // Ysgard's Call 100%
$1.12#4796
"Equipped creature gets +1/+1 for each creature you control."
Pennon Blade 100%
$0.21#14503
"Equipped creature gets +1/+1 for each creature you control."
+1 more matching line
Stoneforge Masterwork 84%
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"Equipped creature gets +1/+1 for each other creature you control that shares a creature type with it."
+1 more matching line