Banshee's Blade 
Artifact — Equipment
$0.28 #16044 0.09 22.9 years
Equipped creature gets +1/+1 for each charge counter on this Equipment.
Whenever equipped creature deals combat damage, put a charge counter on this Equipment.
Equip
(
: Attach to target creature you control. Equip only as a sorcery.)
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Cards similar to Banshee's Blade 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.
Opaline Bracers80%
$0.15↓#26016↓0.52↑22.3 years
"Equipped creature gets +X/+X, where X is the number of charge counters on this Equipment."
+1 more matching line
Gavel of the Righteous80%
$0.27↓#5260↑0.28↑4.4 years↓
"Equipped creature gets +1/+1 for each counter on this Equipment."
+1 more matching line
Chainsaw80%
$1.04↑#3796↑0.181.9 years↓
"Equipped creature gets +X/+0, where X is the number of rev counters on this Equipment."
+1 more matching line
Lightning Reaver77%
$0.58↑#20342↓0.71↑17.3 years↓
"Whenever this creature deals combat damage to a player, put a charge counter on it."
Golden Urn74%
$0.24↓#191580.25↑15.9 years↓
"At the beginning of your upkeep, you may put a charge counter on this artifact."
Umezawa's Jitte72%
$3.22↑#2930↑0.68↑21.6 years↓
"Whenever equipped creature deals combat damage, put two charge counters on this card."
+2 more matching lines
Luxior, Giada's Gift71%
$4.52↑#4429↑0.164.4 years↓
"Equipped creature gets +1/+1 for each counter on it."
+1 more matching line
Stalwart Successor71%
$0.20↓#135960.071.4 years↓
"Whenever one or more counters are put on a creature you control, if it's the first time counters have been put on that creature this turn, put a +1/+1 counter on that creature."