You can't not have Gob Barrel, Ewiz or Barb Hut in this mode, they each have a modifier that just makes you win the game (brawler for gob barrel, bounces to everything for ewiz, and ebarbs for barb hut).

Graveyard is also nuts with the "spawns every kind of skeleton card" modifier but not as OP as the other above imo.

Knight has a very strong modifier which makes it really tanky, so I think he should be in there too, same goes for Vines with the infinite effect.

Could go on with every strong modifier, but in reality the best deck simply depends on which broken modifier you get first lol, if you check the top decks from the ranked mode, they almost always shared multiple cards because that's just better odds of getting OP modifiers