Belt of Giant Strength {1}{G}
Artifact — Equipment
Equipped creature has base power and toughness 10/10.
Equip {10}. This ability costs {X} less to activate, where X is the power of the creature it targets.
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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.
Dragonfire Blade 96%
$1.88#2312
"Equip {4}. This ability costs {1} less to activate for each color of the creature it targets."
Crown of Gondor 93%
$0.39#5626
"Equip {4}. This ability costs {3} less to activate if you're the monarch."
Arm-Mounted Anchor 93%
$0.23#12180
"Equip {2}. This ability costs {2} less to activate if you have one or fewer cards in hand."
Plate Armor 92%
$0.19#8504
"Equip {3}. This ability costs {1} less to activate for each other Equipment you control."