All arcane classes.
They can just take Arcane Disciple (Time) or Arcane Disciple (Celerity).
Divine Classes can just splash a level of Contemplative to grab one of those same domains, but really, Swiftblade doesn't advance divine casting, so...
On a more serious note: Wiz/Sor/bard gets it as a 3rd level spell, Combat Trapsmith gets it as a first level spell. SotAO Paladins or rangers can get it as a third, as well.