I guess it could be interesting within a control-ish deck and abusing the hero power by playing secrets (e.g. kodo) to be maybe able to cast a horseman and hero power one in one turn. I’ve not read anything that the horsemen are different so why not playing one, and bounce it to make sure to have all 4 when needed ?

You can go for Brann. Alot of Synergy and helping with boosting Jade Golems.

Why the Geode ?
sure it is strong, but no synergy at all. I would cut these 2 + 1 Potion of Madness and add 1 Brann, 1 Shadow Pain and 1 Shadow Death…