There is an interesting thread that deals with about anything you need to know about European Myths.  Beowulf, Anglo-Saxon, Arthurian legends, Baltic myths...etc.  (Oops I just realize 
Lalwende has already posted that, lol, good job, 
Lal, got to it before me  

 ).
Anyway, what I wanted to focus on was a Baltic Legend, called, "Battle of the Wizards."
http://www.sacred-texts.com/neu/bw/bw05.htm 
That is the link to view the story in whole.
Basically it deals with a "Great Wizard," and a "Wicked Wizard," who duke it out in a classic Wizard battle.  The part I wanted to focus on was....
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		| Then the Wicked Schlipme stood up, and by his Black Art grew and grew, taller and taller, to great stature | 
	
 
	Quote:
	
	
		| And he (The Great Wizard Nischergurgje) muttered a Spell, and he, too, grew and grew, taller and taller and yet taller | 
	
 
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		| Then they changed themselves into dreadful Storm Clouds. They rushed upon each other. They closed in fierce combat. A mighty roaring was heard. The sky was black. | 
	
 These "spells" these two wizards cast are ones that Gandalf seems to use.
	Quote:
	
	
		| Gandalf's eyes flashed.  "It will be my turn to get angry soon," he said.  "If you say that again, I shall.  Then you will see Gandalf the Grey uncloaked."  He took a step towards the hobbit, and he seemed to grow tall and menacing' his shadow filled the little room. | 
	
 
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		| He raised his staff.  There was a roll of thunder.  The sunlight was blotted out from the eastern windows; the whole hall became suddenly dark as night.  The fire faded to sullen embers.  Only Gandalf could be seen, standing white and tall before the blackened hearth. |