Frozen_Heart
Hero
And wizard lost metamagic when it went to sorcerer. You don't have two classes with an identical signature mechanic.Metamagic was the wizard's thing when it was invented. None of this is carved in stone.
So if the swordmage used a spellbook, wizard would need to get a new signature mechanic. And if both classes had a spellbook, then the swordmage would need its own signature mechanic on top of that such as spellstrike.