I'd say a character with minor magic could cast a number of minor spells per day equal to his or her spellcasting attributes + level. It's high enough so that wizards won't be constantly running out, but it gives a limit still.
Attribute Modifier + Level, but yes - and have some darts. Have fun with that, Mr. Wizard. You're still not getting Quadratic Power Advancement no matter how much you hobble yourself at low levels.
- Marty Lund