I personally have really enjoyed using this card with decks that have strong filtering mechanisms. For example, Aragorn with Estel is super strong repeatable filtering that grows if you give him more traits with the other ALeP titles. Combine that with Elven-light and suddenly 100 cards in your deck doesn't seem so bad. Then you get an automatic threat reduction, heroes not exhausting to quest, being able to search and play any card reducing its cost by 3, or put it in your hand if you don't want to play it yet. If you start with low threat or are desperate you can use the ability on side A of the card as extra filtering, but I don't rely on it since you only have one big threat reduction you don't want to burn too soon.
I'm considering other decks this contract would work well with besides Aragorn, though he himself is super flexible and can work with Noldor, Gondor, or Dunedain. Dwarves, since they get an obscene amount of card draw, could work well. Galadriel with her Mirror of Galadriel seems like another option with potential, but losing her threat reduction would feel really bad.