Creatures can't attack planeswalkers you control unless their controller pays 1 for each creature they control that's attacking a planeswalker you control.
4WW, Exile Onakke Oathkeeper from your graveyard: Return target planeswalker card from your graveyard to the battlefield.
![Onakke Oathkeeper [Commander Masters]](http://www.cardmerchanttakapuna.co.nz/cdn/shop/files/14886c4d-1d3d-5380-a178-7c7ad7c7b0bd.png?v=1736617673&width=1445)