71% winrate Big Priest anti-aggro list (Standard)

No matter what, you want Barnes. The winrate of your deck increases significantly if you have Barnes. If you already have Barnes, you can keep Eternal Servitude since you'll immediately be able to resurrect your dead minion. Shadow Visions is an insanely powerful card since it lets us pull so much utility from our deck, so we almost always keep that card. 

This is the reason you are running my list. With as many aggro and decks that are on the ladder, these cards are all extremely potent. Generally you'll want to try to combo pint-size and horror together, but if you have an opportunity to horror without having to use pint-size, do it. Madness helps clear early game minions and is really strong against murloc paladins if they grimscale chum into something else. And obviously, Barnes is what wins you the game, so look for him.

Most control lists you will face right now will be warlocks, where this deck shines. Do not waste your removal on their early minions (horror is fine to use). What we want to do against them is either potion of madness their lackey and kill it off, or pint-size their voidlord to 0 attack, steal it with potion, then pain it to kill it to deny them the resurrect and give ourselves 3 voidwalkers. In the control matchup, shadow essence is an important keep as well since you likely won't have to worry about early game too much, and it gives you a fallback if you don't hit Barnes. Once again though, always go for Barnes.