Quintessential Katana 
Artifact — Equipment
Equipped creature gets +1/+1 and has "Whenever this creature deals combat damage, untap it and you gain 2 life."
Whenever a Ninja you control enters, you may attach this Equipment to it.
Equip {2} ({2}: Attach to target creature you control. Equip only as a sorcery.)
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T-45 Power Armor 88%
$0.66#8517
"Equipped creature gets +3/+3 and doesn't untap during its controller's untap step."
+1 more matching line
Vulshok Gauntlets 88%
$0.15#24618
"Equipped creature gets +4/+2 and doesn't untap during its controller's untap step."
+1 more matching line
Hero's Blade 83%
$0.30#1902
"Whenever a legendary creature you control enters, you may attach this Equipment to it."
+2 more matching lines
Foot Chopper 83%
$0.29#13178
"When this Equipment enters, create a 1/1 black Ninja creature token, then attach this Equipment to it."
+1 more matching line
Sai of the Shinobi 83%
$0.33#15317
"Whenever a creature you control enters, you may attach this Equipment to it."
+2 more matching lines
Stormrider Rig 83%
$0.17#20580
"Whenever a creature you control enters, you may attach this Equipment to it."
+2 more matching lines
Inventor's Goggles 80%
$0.24#23705
"Whenever an Artificer you control enters, you may attach this Equipment to it."
+2 more matching lines