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}
Mana cost
1
Mana value
1
Printings
From
$4.51
EDHREC rank
#4442
Buy
Formats
Pioneer
Legal
Modern
Legal
Legacy
Legal
Vintage
Legal
Commander
Legal
Rulings
29 Apr 2022
Unless another effect is making that planeswalker a creature with a power and toughness, the equipped planeswalker has base power and toughness 0/0.
29 Apr 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.”