Highlander Mage is not terrible without LPG. The winrate will take a slight knock but I think it will be viable. And hey, King Phaoris just got buffed.
I think LPG still goes in the deck as well. You can cast it with a body off Pilgrim. (which is massive since 7 mana do nothing the turn you play it is a real issue.) 8 mana cast LPG and get a 5/5 is better than just playing LPG on its own.) And you can reduce it with the Naga. It's supported by the rest of the deck far better than before this expansion when it saw no play.
CC at 4 doesn't kill the card in Highlander either. If aggro starts getting cocky then Highlander Mage is still a great choice.