1. N’Zoth, the Corruptor
N’Zoth was another Old God that many people underestimated. The issue was that people saw the Deathrattle tag and saw that Sludge Belcher and Piloted Shredder were rotating out. When neither was replaced with new overpowered Deathrattle minions, most people dismissed N’Zoth as being too weak. What very few predicted was that N’Zoth would find his home in slower control decks. As it turns out, N’Zoth only has to bring back one or two high value Deathrattle minions in order for him to be worth it.
N’Zoth found a strong home in Control Paladin, where the deck is based around keeping the board clear for the first few turns, and then dropping large Deathrattle minions. It runs quite a bit of healing so that big plays can be supplemented the next turn, allowing for large Tirion or N’Zoth plays much more confidently. Tirion in particular is strong due to his Taunt, stopping any counter push against N’Zoth. Backed up with Sylvanas and Cairne, N’Zoth brings an army whenever he enters play.
Finding a home in one of the top tier decks of the new meta, N’Zoth has surprised everyone and managed to slide into the position of strongest Old God.