Luxior, Giada's Gift is a mythic Legendary Artifact — Equipment card from Streets of New Capenna Promos (PSNC), collector number 240p. Current market price: $5.64 (foil $4.75), TCGplayer market prices via Scryfall.
Equipped creature gets +1/+1 for each counter on it. Equipped permanent isn't a planeswalker and is a creature in addition to its other types. (Loyalty abilities can still be activated.) Equip planeswalker {1} Equip {3}