Historical Rules · 3 February 2023
Rule 702.6e
Official source text from the 3 February 2023 Rules release
“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.”