The technique is rather simple, yet at the same time extremely useful. The way I see this technique being utilized is through Offense, Defense, and as a supplementary technique all together. Offense, in a way that it makes your reach longer incase you're in a close range battle and your opponent just evaded a kick backwards. For defense, I can most like use it to kick off thrown projectiles such as kunai's and shurikens if my bio had the proper Taijutsu mastery. Supplementary as in dodging or evading an attack, basically launching myself off the ground using it.
Pro's: What I mentioned in that paragraph.
Con's: It's a B rank earth technique, the weakest of lightning attacks can break through it. Also based on the description it has no direct lethal ability, unless ofc I can shape the pillar into a spear. Which you should be able to answer no?
Combo? I can use it with my flare technique lel to extend the range.