In no particular order,
Goblin Armory (foil),
Simbelmyne (foil),
Terrible and Evil (foil),
Hides (foil), and
Hate (foil) strike me as among the top five hardest to get. Mostly because they appear in nearly every version of their deck type either in quantity (i.e., four
Goblin Armory in a
![Moria [Moria]](https://lotrtcgdb.com/forums/Smileys/classic/moria.png)
deck, four
Hides in a
![Dunland [Dunland]](https://lotrtcgdb.com/forums/Smileys/classic/dunland.png)
deck) or in importance (a few copies of
Simbelmyne appear in most
![Rohan [Rohan]](https://lotrtcgdb.com/forums/Smileys/classic/rohan.png)
decks,
Terrible and Evil is a staple in a 6+ companion deck, and
Hate is a common
![Sauron [Sauron]](https://lotrtcgdb.com/forums/Smileys/classic/sauron.png)
card).
I have seen foil versions of these cards go for between $10 and $25 USD ($25 being the outlier high price). About a year ago I paid $13 for a
Goblin Armory (foil) and I was more than content with that. But I've been looking for two
Goblin Armory foil and three
Hate foils since Fellowship of the Ring came out.
-wtk
Edit: That wasn't meant to be an end-all, be-all list. But those are cards I would likely value near the top of a list. Again, want to remind everyone that I didn't put them in a particular order.
-wtk