Thief %/s (KMS Unlimited and GMS Tempest)

So stupid question, and I'm not sure if I asked this already so apologies in advance. I noticed there's a table for Dual Blades and no CD Final Cut, which I'm taking as Final Cut can be kept up indefinitely as long as you don't die. How do you get that continuous duration? Can you achieve it without having to have more than one Mechanic card in total for your character deck?