So I try and match my sets to how Magic sets are going presently, however I created Okundwa before the current updates to keywords, so protection is still in the evergreen bank for Fetish Wars my other unfinished set.

On a different note the card no longer grants enchantment protection in addition to the fetish power. Feylan, who will appear in a WG incarnation in this set, will face-off with Khzgeru in an attempt to restore order to her home plane. Khzgeru, Bone Shaman attempts to goad and provoke Feyland by making a new fetish from the skull of her father. Unfortunately, Khzgeru is short-sighted (which seems appropriate for a RB character) and designs this fetish to protect against what he knows of Feylan, a mage who seems to draw her energy from the sources of mana that we know to be green. This short-sightedness comes to fail when Feylan uses what we know as white mana sources when she fights back with her enchantress spells.

Since you are a player and not Khzgeru you obviously are not bound by his story actions to make gain protection solely against green, but as this fetish rather represents the replacement of an already existing fetish (the skull Khzgeru wears in the artwork I selected would not be from Feylan's father) you are still discarding the original piece you were wearing (protection from enchantments). If this were a real set with artwork for all the cards other depictions of Khzgeru would have show him wearing his new mask fetish instead of the one on his planeswalker card.

EDIT: Okundwa, being a plane where the use of enemy-colored magic is prominent and allied-color magic is virtually unused (save the two aforementioned characters) the idea of using what would be green and white magic together would be a style that Khzgeru is totally unfamiliar with, and with the only selesnya-colored card in the block being Feylan, Mystic Warden it totally fits that in limited there'd be no way to get protection from GW.