Cheapest priced copy (Streets of New Capenna): $8.99 at Card Kingdom, near mint, their price list as of .
Luxior, Giada's Gift 
Legendary Artifact — Equipment · Mythic · Streets of New Capenna · #240
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}
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
4 printings · $8.99 to $13.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Streets of New Capenna Promos | 240p | Mythic | $9.99 | $10.99 |
| Streets of New Capenna Promos | 240s | Mythic | — | $12.99 |
| Streets of New Capenna | 240 | Mythic | $8.99 | $9.99Out of stock |
| Streets of New Capenna | 439 | Mythic | $10.99 | $13.99 |
2 rulings from Wizards of the Coast
- 29 April 2022“Equip planeswalker” is a variant of the equip ability. “Equip planeswalker [cost]” means “[Cost]: Attach this permanent to target planeswalker you control as though that planeswalker were a creature. Activate only as a sorcery.”
- 29 April 2022Unless another effect is making that planeswalker a creature with a power and toughness, the equipped planeswalker has base power and toughness 0/0.