Hand of Vecna 
Legendary Artifact — Equipment
$0.37 #9740 0.12 5.2 years
At the beginning of combat on your turn, equipped creature or a creature you control named Vecna gets +X/+X until end of turn, where X is the number of cards in your hand.
Equip—Pay 1 life for each card in your hand.
Equip 
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Cards similar to Hand of Vecna 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.
Dark Knight's Greatsword80%
$0.24↓#11849↓0.061.4 years↓
"Equip—Pay 3 life. Activate only once each turn."
Brotherhood Regalia78%
$9.98↑#563↑0.51↑2.3 years↓
"Equip "
"
Nightmare Lash78%
$8.74↑#111180.0623.0 years↑
"Equip—Pay 3 life."
+1 more matching line
Sigil of Distinction76%
$1.80↑#14194↓0.1218.0 years↑
"Equipped creature gets +1/+1 for each charge counter on this Equipment."
Horn of Valhalla // Ysgard's Call71%
$0.93↑#5118↑0.174.4 years
"Equipped creature gets +1/+1 for each creature you control."
+1 more matching line
Gavel of the Righteous70%
$0.27↓#5203↑0.00↓4.5 years
"Equipped creature gets +1/+1 for each counter on this Equipment."