Is there any existing rule that would prevent a Duskblade from using the Arcane Channeling ability with the feat Arcane Strike (Complete Warrior) on the same attack? Arcane Strike is a free action so it seems like it should work and since he can’t do it until 9th it sounds good, but not unbalancing.
For example, a Duskblade 9th could cast Shocking Grasp and use Arcane Strike using up a 3rd level slot and his first attack would be +3 to hit, do regular weapon damage, +5d6 electricity damage and +3d6 arcane damage. The Arcane Strike would affect all his attacks for the round. He would give up 5 levels worth of his spells, but he would have a nice round of combat.
For example, a Duskblade 9th could cast Shocking Grasp and use Arcane Strike using up a 3rd level slot and his first attack would be +3 to hit, do regular weapon damage, +5d6 electricity damage and +3d6 arcane damage. The Arcane Strike would affect all his attacks for the round. He would give up 5 levels worth of his spells, but he would have a nice round of combat.