[Slydria]

I agree with the first two changes but Copy spells being once a battle only seems far too limiting.

I'd prefer a Copy Spell specific cooldown, say 3 Rounds when the Copy Spell is cast.

That way it's still frequent enough that you could have your "pick and choose" style of mage without being too gimped yet still slow enough that it's a notable flaw and there's some incentive for the intended style of taking spells from your enemies to throw back at them.

EDIT: I completely disagree with nerfing the effectiveness of stolen spells that hard, that would only ensure most people just run the spells that aren't impacted or where damage won't matter (such as Death Knighting).