HE aren't exactly the worst faction in manipulating what you will draw next.
Follow the portent wouldn't be useless.
-It will give you extra tokens for more damage as soon as the Eltharion is in the game.
-It can give you a token the turn it enters the game. (unlike many other quests)
-It is a quest so it is hard to get rid of it.
-It can help you to get the Eltharion earlier.
-Its Action is so medicore that the unit questing on it wouldn't be the first aim for unit destruction so your tokens are somewhat save.
Eltharion's first Action is nice since he can get tokens from Elven Scouts. So even if you have to use "Flames of the Phoenix" at some point you can collect the tokens and dash put some more damage.
Flames would be a nice addtion anyway since you can use all your Elven scouts and Silver Helm Detachment again after using their tokens.
I would really love to play such a deck. Sounds like a lot of fun.
Deck list please(with link to deckbox.org)
Why is everyone so shy about posting deck lists on here?