Talk:Lightning Speed, Tsukiusagi/@comment-10483040-20150614004330/@comment-5777478-20150614015310

Nothing says you can't. If you already have a skull warriors deck and are upgrading it, this can replace Irukamaru or something else. If you're building a new deck, there's nothing to replace since nothing has been built yet.

Ziun's deck was a rush deck with him as a finisher. He needed as many no/low cost 2+crit monsters. The traditional underworld deck has better options than Irukamaru. At least that's how I see it.