15 cards where the text includes “+4” and the card types include “equipment”

Barbed Battlegear (Scars of Mirrodin #139)
Batterskull (Double Masters #234)
Demonmail Hauberk (Innistrad #221)
Enormous Energy Blade (Kamigawa: Neon Dynasty #96)
Greataxe (Adventures in the Forgotten Realms #245)
Haunted Plate Mail (Magic 2015 #218)
Magebane Armor (Magic 2010 #214)
Meteoric Mace (Commander Masters #243)
Slayer's Plate (Shadows over Innistrad #264)
Strandwalker (Mirrodin Besieged #137)
Sunforger (Commander Legends #473)
Sylvok Battle-Chair (Phyrexia: All Will Be One #184)
Thirsting Axe (Eldritch Moon #202)
Vulshok Gauntlets (Double Masters #305)
Webspinner Cuff (Kamigawa: Neon Dynasty #214)

The arc of my blade has carved a path of light to the end of these results.