Mask of the Hero

Equip {x}
If {w}{w}{w}{w} was paid when casting Mask of the Hero, search your library for a Planeswalker. Reveal it, then put it into your hand. Shuffle your library afterwards.
You can only equip this artifact to Planeswalkers.
Equipped Planeswalker's loyalty is X, which is equal to the mana paid to equip this.