Magic Forums

I don't understand if it's a bad thing to use spells for yourself rather than using them to help others. Would you recieve bad karma if you used one for yourself? I have only cast two spells so far, a cash spell for me, (which worked) and a pick-me-up spell for my dad. When I used the cash spell the milk in my house suddenly turned sour. But when I used the pick me up spell, nothing bad happened. Can somebody please help me figure this out?