Hedron Matrix 
Artifact — Equipment
$0.41 #17052 0.60 16.4 years
Equipped creature gets +X/+X, where X is its mana value.
Equip
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Cards similar to Hedron Matrix 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.
Great Defender84%
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"Target creature gets +0/+X until end of turn, where X is its mana value."
Ninja's Blades82%
$0.32↓#8102↑0.18↓1.2 years↓
"Equip 
"
"
Emissary Escort80%
$0.19↓#9117↑0.23↓1.1 years↓
"This creature gets +X/+0, where X is the greatest mana value among other artifacts you control."
Tangleweave Armor78%
$0.30↓#12105↑0.00↓3.6 years↓
"Equipped creature gets +X/+X, where X is the greatest mana value among your commanders."
+1 more matching line
Bludgeon Brawl75%
$0.50↑#195360.12↓15.3 years↓
"Each noncreature, non-Equipment artifact is an Equipment with equip 
and "Equipped creature gets +X/+0," where X is that artifact's mana value."
and "Equipped creature gets +X/+0," where X is that artifact's mana value."
Boon of Boseiju72%
$0.22↓#12140↑0.504.5 years↓
"Target creature gets +X/+X until end of turn, where X is the greatest mana value among permanents you control. Untap it."
Excalibur, Sword of Eden70%
$17.52↑#912↑0.592.2 years↓
"Equipped creature gets +10/+0 and has vigilance."
Accelerated Mutation70%
$0.08↓#25084↓0.25↓23.3 years↑
"Target creature gets +X/+X until end of turn, where X is the greatest mana value among permanents you control."