That is a nice dream… but will never be a reality with Seedlock, Miracle Rogue, Shadow Priest or Pirate Rogue.
You must be playing some other Wild than most people because in Wild games are usually finished by turn 5. Big Shaman, Miracle Rogue, Garrote Rogue… best decks in the format and all may kill you before turn 5.
I understand all people have their own gripes with Wild meta but when I hear someone says Renathal is a problem in Wild I laugh heartily because it is not even top 20 most problematic cards in Wild.
Nope, you don’t. With cards like Archbishop Benedictus, Tony, Jade Idol and all the rest you have multiple ways to beat Renathal decks in the long run.
And of course, even if Renathal was not a thing bomb and plague decks would still be practically unplayable because most of the meta finishes there matches before those tactics come into play.
I think 8 is probably fine, it 4 hits 30 HP heroes and 5 hits Renathal decks. 10 was way too much in retrospect understanding how strong the other excavate tools were in general.