Fantasy worlds have one standard prerequisite:  Magic.  But, how does a writer use it in his story?  Is it enough to simply have the wizard do whatever needs to be done and all the writer has to do is shrug and say "It's magic" when asked how?

Everything needs a logic, it's own internal consistency, even magic.  What the writer has to do is decide what that internal logic is before he starts having wizards cast magic spells.  These laws of magic will prevent the problem of wizards able to do anything one moment then being arbitrarily limited the next time the writer needs him to be.  They will dictate a few limits around which the writer can hang some juicy plot elements.

The "laws" I suggest derive from common sense.  I view a wizard as akin...

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