Wait...aren't all the Heralds cosmic level characters? You are asking us who can defeat a team of characters that is far more powerful than themselves?
In that case....
Wolverine
Captain America
Batman
The Jobber Auras alone are way too much for the heralds to handle.
__________________
Humans are afraid of the dark.
And yet… At the same time, we’re fascinated and bewitched by it.
Maybe that’s why humans drink the darkness that is coffee.
Let's not forget the once in a lifetime chemical combination that gave him enhanced athletic abilities and his experimental football uniform. That's right, it's a super prototype football uniform, FEAR HIM!
Dr. Strange has to be on a team to take these guys out. But Avalon, that team is not good enough to beat the Heralds. Assuming Doomsday is only allowed 1 ringout, he gets taken out quickly by the Heralds. Same with the Flash, he is no match for SS at all. Amazo and Strange are tough but matched up against these 4 heralds, I dont think they can win. I dont think its possible to come up with a team not including cosmics that can beat this team.
Assuming we are using the best versions of all characters, this team is just fine. Flash and Doctor strange alone pooling their abilities is a significant threat. DD at his best will rip apart any herald silly enough to get anywhere near him...which they ALWAYS do. Amazo at full potential is more than any herald can handle.
__________________
Humans are afraid of the dark.
And yet… At the same time, we’re fascinated and bewitched by it.
Maybe that’s why humans drink the darkness that is coffee.