Vulshok Gauntlets 
Artifact — Equipment
Equipped creature gets +4/+2 and doesn't untap during its controller's untap step.
Equip {3} ({3}: Attach to target creature you control. Equip only as a sorcery.)
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Cards that do something similar expected a card that isn't here?
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T-45 Power Armor 98%
$0.66#8517
"Equipped creature gets +3/+3 and doesn't untap during its controller's untap step."
+1 more matching line
Quintessential Katana 88%
$0.22#15008
"Equipped creature gets +1/+1 and has "Whenever this creature deals combat damage, untap it and you gain 2 life.""