"Just another kicker" is not the right way to think about it. Having the jacks change during the routine, is something an audience won't expect, so if it's performed well it gets a stronger reaction than the regular effect.hes saying he wants to (in the routine) place the black jacks facedown onto the table. He then wants the 7 and 9 to trap the eight once again (seemingly pointless). the spectator then looks at the "jacks" on the table, and sees that they are the 6 and the 10, hereby completing the production of a straight/climax to effect.
its good, but is it useful or just another kicker?