I tried serching for an answer on the forums for this and came up with nothing, so here goes.
How does an Evoker's Intense Spells ability apply to Mage's Sword? Does it only do the extra damage on its first hit? Or is it each time it strikes?
Once per spell, so I'd say just on the first strike. That kinda sucks, though.
All the same, I'd probably allow it on every hit. Adding +1 damage/2 levels to its normal damage isn't overpowered, IMHO.