Arc Spitter 
Artifact — Equipment
Equipped creature has "{1}: This creature deals 1 damage to target creature that's blocking it."
Equip {1} ({1}: Attach to target creature you control. Equip only as a sorcery.)
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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.
Pathway Arrows 84%
$0.13#14768
"Equipped creature has "{2}, {T}: This creature deals 1 damage to target creature. If a colorless creature is dealt damage this way, tap it.""
+1 more matching line
Trusty Boomerang 82%
$0.17#14606
"Equipped creature has "{1}, {T}: Tap target creature. Return this card to its owner's hand.""
+1 more matching line
Siren Song Lyre 82%
$0.19#26534
"Equipped creature has "{2}, {T}: Tap target creature.""
+1 more matching line