Best spell to go with my Army?

I'm a mediocre player in silver 2, and I've been wondering what the best spells were to go with my army?
I use:
16 balloons
3 wallbreakers
17 archers
17 barbarians

What spells would go best?

Well, I bet lots of people would say rage balloons would be the best since they increase the damage and speed of troops. I'm guessing your balloons are not that high level, right? Anyways, if you do choose to use rage spells (or have them at least), I think it wouldn't be too much of a problem in terms of time, since you probably wait a long time for your balloons to be trained.

If you use heal spells, they would probably be useful if you're getting attacked by...let's say, wizard towers. Heal spells would be really useful if you survive air bombs too. If the base you're attacking has low level air bombs, you most likely would not die from just one hit (of the bomb).

Anytime you use balloons, you should bring a couple rage spelled.

Whats your spell factory lvl at?

I have level three spell factory lvl three balloons. Also, i just made it to silver one. Thanks!