Hey @Blizzard! Karazhan Chess Set is glitched. I had a golden Turquoise Skitterer + Hawkstrider Herald, and although it summoned the additional Turquoise Skitterers, the Hawkstrider Herald DID NOT trigger the deathrattles. Additionally - my wife played with Karazhan Chess Set, and had a large Ancestral Automoton that did trigger properly, but the Immortal (she was playing Tess and took it from the Protoss hero) DID NOT gain the stats. It was about an 11/11 instead of a 500/500, we lost the game due to this.
Please fix this glitch.