Blizzard has announced that the Legendary Evoker Weapon now has bad luck protection in Patch 10.1.5! Edit: Further Blizzard clarification has been added.
Further ClarificationBlizzard has confirmed with Wowhead the following regarding the new Bad Luck Protection:
It's not retroactive, but Blizzard did take into consideration that the raid has been out for 2 months so it ramps up quicker than if there was «bad luck protection» from the get go. Defeating Mythic Sark will get you get the maximum Bad Luck Protection which is the same as defeating Heroic then Mythic (similar to the actual drop). Original Post The chance for Evokers to receive the Cracked Titan Gem now increases each time you defeat Scalecommander Sarkareth on Heroic or Mythic difficulty.Developers' note: We'd like to see Nasz'uro, the Unbound Legacy become more obtainable for players who are regularly completing the highest levels of difficulty of the raid, while also keeping its status as an aspirational reward that any Evoker may work toward. Read more on wowhead.com