I use furious chicken a lot, but regular not Gold. So it's probably worth it to pick up another Gold and get my gold version up to level with my regular (DEC bonuses, yay!)
The Bogeyman I haven't seen before and need to figure out how to fit into my decks. Goblin Mech I almost never use. I'm totally fine keeping a cheap not-gold version for the few times I actually use it.