Hearthpwn

So the goal is to build deck for my 4 year old son who cant read. I tried to avoid cards that can hurt its user when used incorrectly. For example doomsayer or corrupting mist into my own board is basically a suicide. Compared tho them, hysteria and unstable felbolt have much lower potential of backfiring even when played on incorrect situation or target. Keep in mind that he doesnt know how to trade and decides targets of spells and attacks randomly. So Im basically trying to create self-piloting deck, that has chance of winning even in hands of bot whose algorithm I cant influence except for very general advice, such as 'always keep skull' or 'never keep card that costs 5 or more'. Furthermore, the concept of efficiently used mana is impossible to explain to him so he just drags and plays any green card he can at any given moment. In addition, he insists on using the magician who allows us to mix our own potions. Please dont question why does he even play under such circumstances and rather take it as a mental exercise. We would both very much appreciate any kind of advice.