"Yes," Izumo decided, and started digging through his pockets. He pulled out a card - King of Hearts. He pressed it between his palms and started a quick series of signs. His fingers flashed rapidly, and he nicked his thumb on a senbon. He smeared the blood across the card, and blew on it to dry it.
When it was, he reached around and poked it into Genma's back pocket. The illusion rippled over him, and suddenly hair hair was the same glossy blue-black as Izumo's.