Oath of Hephaestus

When Oath of Hephaestus enters the battlefield,
you may search your library for target
Equipment, reveal it, and put it onto the battlefield under your control.
Whenever a planeswalker enters the battlefield
under you control, target Equipment gains
"Equipped creature has '{r}, {t}: This creature
deals X damage to any target, where X is three
times the number of planeswalkers you control.'"
until end of turn.