Really having 1 is already great. Yes having an extra in case of destruction isn't bad, but considering six sams have ample revival and protection 1 is easily enough. Plus you usually won't have more than 1 on the field at the same time, and Kizan is special summon clause the monster
I honestly forgot the Six Sam revival card was already in the game (as restrictive as it is).....and that Shi En could negate a Floodgate on summon. I guess more digging for a Kizan when I get more gems.