Hedron Matrix 
Artifact — Equipment
$0.41 #17258 0.12 16.5 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 Defender85%
$3.42↑#29598↓0.0532.4 years↑
"Target creature gets +0/+X until end of turn, where X is its mana value."
Ninja's Blades82%
$0.47↑#7983↑0.32↑1.4 years↓
"Equip 
"
"
Emissary Escort80%
$0.19↓#9002↑0.00↓1.2 years↓
"This creature gets +X/+0, where X is the greatest mana value among other artifacts you control."
Tangleweave Armor78%
$0.23↓#11550↑0.31↑3.7 years↓
"Equipped creature gets +X/+X, where X is the greatest mana value among your commanders."
+1 more matching line
Bludgeon Brawl75%
$0.53↑#197500.38↑15.4 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."
Excalibur, Sword of Eden72%
$18.68↑#928↑0.58↑2.3 years↓
"Equipped creature gets +10/+0 and has vigilance."
Boon of Boseiju72%
$0.31↓#12372↑0.29↑4.7 years↓
"Target creature gets +X/+X until end of turn, where X is the greatest mana value among permanents you control. Untap it."
Accelerated Mutation70%
$0.13↓#25369↓0.00↓23.4 years↑
"Target creature gets +X/+X until end of turn, where X is the greatest mana value among permanents you control."