https://youtu.be/4Z2xcW1m028

Here's the video of both DX Seiken Swordriver with Kaenken Rekka from Kamen Rider Saber.

And now, I've identified this Kamen Rider now and his name is Kamen Rider Buki (仮面ライダー武器 Kamen Raidā Buki). Looks like he's wearing a different Driver from Kamen Riders Saber, Blaze, and Espada's Seiken Swordriver. It is presumed that Kanzen is also wearing a same Driver as Buki.