Given that Freljord isn't a key part of any meta deck (endure spiders doesn't really count as Frelyord) I thought of some buffs that might the region more playable
Catalyst of Aeons becomes 5 Mana "Gain an empty mana gem and heal your Nexus 5. Enlightened: Draw a unit with 5+ Power"
-This change would make Catalyst a lot better once you've reached 10 mana crystals, at which point the current Catalyst becomes "5 Mana Heal 3", which is awful and game-losing. The additional heal would help Freljord stabilize against aggro better without having to run Shadow Isles.
Troop of Elnuks becomes a 4 Mana 3/3 with "Play: Draw 2 Elnuks in the top 10 cards in your deck. Give all other Elnuks everywhere +1/+1.
-This change would make Elnuk shuffle decks a possibility, because it would give them access to more card draw and would make playing a ton of Elnuks a viable strategy, as they would grow bigger and bigger. I think this version would not be able to be run without shuffle support, but if it were proven too powerful, it could be changed to draw from the top 6 cards instead.
Kindly Tavernkeeper becomes a 3 Mana 2/4 with "Play: Heal an ally or your Nexus 4."
-This would make the tavernkeeper a consideration in Freljord decks, and would help make Freljord one of the Healing Regions, which could lead to it being incorporated in some decks that would have otherwise used Shadow Isles for healing.
Entreat becomes 2 Mana "Draw a Champion. Enlightened: Give it +1|+1"
-This change buffs up Entreat just a little bit, and contributes more to the buffing and Enlightenment archetypes, which do not currently seem to be working.
Unscarred Reaver gains Challenger
This change would make it easier to enable Unscarred Reaver, and make her more powerful when she actually does get damaged. This is helpful because without Challenger Unscarred reaver can stay as a 0/3 for a really long time, and even when she does get damaged she can get killed by a 2/1, making it almost impossible to successfully attack with her. With this buff, the Scars deck could become potentially viable. This could make her too good against 1/1s, in which case her health could be reduced to 2
Tarkaz the Tribeless gains Overwhelm
-This change would make Tarkaz better by requiring your opponent to actually block him instead of just using a 1/1. This change could possibly make him too good though, in which case his health could be lowered to 7.
So what do you all think about these changes? Would it be enough to make Freljord viable, or did I miss some key cards that need to be buffed?