CCP Rattati, the dailies are a mixed bag. Some are good, although many are impossible.

You obviously are randomly generating the list (except for the one key).

I suggest that you change the solution to this:

1 - key, same as before.
2 - Enter and finish N battles and accept the fact that farmers will sit and do as little as possible. Or only count battles that earned SP (although that will cause a problem when Scotty screws up the matchmaking).

For the remaining 8 (4 since an event will suck up four of them) limit them to N of a list of items, not 3 of the same challenge with different requirements and rewards.

Also, the upper limit needs to be ranged to the abilities of the Merc. A low level recruit doesn't stand a chance of winning 9 battles or killing 75 Mercs. They need to be within their grasp.

On a personal note, I don't stay if the challenges are all the same, just with ever increasing numbers. Boring. Also, I ignore the dailies if my friends show up. If they happen that's cool but I am actually only still here because I still have a few friends that play the game.