Teebu's Blazing Longsword is regard as the most famous One-hand lightsaber in World of Warcraft. With the enchanting effect itself,  which can superimpose with its light. You can freely select a color that suit for your transmog set since the different enchant showed different luminous efficiency.

Because of its ultra-low drop rate and exuberant colors, many people have to collect a large number of wow gold or waste a lot of time to get the Teebu's Blazing Longsword.

Of course, you can transmog your One-hand weapon to Teebu's Blazing Longsword by Transmogrifier(get Teebu's Blazing Longsword first), and match with your unique transmog set. You will become the focus of people's attention! Then you will find that is worth to spend more wow gold to have it.

Source:    

World drop: Drop rate is only 0.01%.

Junkboxes: Stolen by Rogue(Used for Ravenholdt reputation, Insane in the Membrane).

Garrison Salvage Yard: There is also the possibility of looting it from Big Crate of Salvage.

Auction House: Buy it from AH with wow gold is the simplest and quickest way to get Teebu's Blazing Longsword.

One-Hand Swords with the same effect: Blade of Wizardry and Spellfire Longsword.