Hearthpwn

I feel like with Patron a 5 mana minion+super powerful effect his stats shouldn't be more than 3/3

opinions?

No

For 3 mana then? Probably too strong.

I haven't been deep into Wild ladder, but i haven't seen a Patron in ages.

My reasoning is that Patron power level is obsolete. A 3/3 Cobalt would be completely unplayable.

Too many efficient AoE in the game.

3/5 is minimum balanced statline. 6/5 stats if played (more than default 5/5), but requires minion on board.

How about a 4/4? It's a nerf but it also nerfs priest to an extent

Effect requires minions on board and then happens at the end of turn, it's reasonable and gives plenty of time to respond

Blizzard just created those cards by accident, such as Bonemare and it will stay being existed until it rotates out. There's nothing much we can do anything about it. Obviously, they need to get nerfed too but Blizzard just want to earn some amounts of cash and make the game more natural by making fewer balance changes, I wonder if they are going to nerf some cards in some days? It would be great to see that one coming.

He should be a 0/0 so he dies when he hits the board.

To answer your question, no it doesn't need to be nerfed. As others have said, it has vanilla stats and requires another minion to be out to benefit from the effect.

They had no choice.  The standard format was already mired-in by the third set, if they didn't print some sort of power creep no one would buy the set.  Look at the decks, do they have a lot of K&C cards?  Dragon Priest adds 2 from the expansion - would you really need to buy any packs to make that deck if you already ran priest?  

TL:DR No point asking Blizzard to balance something they intended to make stronger than other cards in the first place.