I've been discussing some good Magery 0 spell choices with one of my players, who is working on a elven character for our DFRPG/DF game.
It's surprising how many spells there are that need little more than Magery 0.
Here are a few standouts to me:
Dark Vision - an easy path exists through Night Vision and then only Keen Eyes, and a longer path through 5 L&D spells. But it's Magery 0.
The downsides to this is cost - it's an expensive spell and someone with Magery 0 probably lacks the 15 to discount the energy demands. But it dramatically increases the usefulness of the character with it.
Continual Light is also useful, because it can be cast ahead of time for light sources. Handy when the other casters are busy or down, or too lazy to make you a glowing rock.
Hush is a great spell for scouting, and also seems doable without Magery. Mage Stealth is even better.
Ignite Fire is good from a survival perspective. Purify Water is as well - and it requires Seek Water.
Any other ones that seem like good choices? Remember Magery 0. Levitation would be useful, so would Missile Shield or Lend Energy, but they require higher Magery.
We're using Spells and GURPS Magic subject to the DF prereq rules here, if that helps.
As I mentioned, though, skill level will hamper you here. Magery 0 and, say, an IQ 10-12 caster means skill 8-10 for 1 point. Nothing that requires resistance, casting at a penalty, or works best on multiple subjects is going to work here.