MArcomage

I feel like there are already too many undead commons that do a small attack for gems+recruits. The addition of far sight doesn't make this one much more interesting, I'd say.

IMO Undead decks need a common Far sight card. The only one Undead/Far sight is Stalker and he is mediocre for uncommon card.
It's not about attack, it's only about Far sight that would fit Undead decks.

I'm fine with that. But there's nothing stopping you from making a far sight common undead with an interesting effect. :P

Maybe something like "If tower < wall: do a lot of damage else: do a little damage" (on the theory that archers like attacking from cover, and because undead has a few cards that increase wall).

Also, it might be nice if the card had an all-recruits cost. Undead has lots of cards that use either just gems, or an equal number of gems and recruits. A skeleton archer is very military-sounding and not particularly mystical, so I think it makes sense giving it a recruits cost.

Just some random thoughts. There are tons of possibilities.