Class Combination: Duskblade/Swiftblade

[Neftren]

Incorrect. According to the feat: you may learn these spells as normal for your class. So you could learn it once you can cast the level of spell that the domain grants. The real problem is that the Celerity domain has Haste as a 4th-level spell, which isn't until Duskblade 13. And even then, its uses are very limited, given the few spell slots at higher levels.

I've got that part figured out, and the game I'm playing in is going to be quite high, so it'll be pretty useful at that point. Besides, how many times are you going to cast haste per encounter anyway?

Besides, the "Spend All Spell Slots" is fluff. Not a big deal if I did that previously somewhere along the way.