So after the Nilfgaard Patch i have been playing around with different Monster Consume archetypes and have made a deck that seems very very promising.
http://imgur.com/a/PxEBj
The basic idea is to play a single Nekker, Monster nest, drop a Arachas Behemoth and then continuously consume the spawned Arachas.
The Crones can win you games alone against everything but monsters. You can drop them immediately for 23 Strenght, thinning your deck and bringing your opponent in a bad situation. If he chooses to play a card and cant match the strength, you can simply pass. Now he has to either give you the round while being a card down, or play another card to win the round, leaving him at a 2 card disadvantage and having to go first. This advantage can then be further increased or held with Avallac'h.
You usually dont want to consume Nekkers, because you want to keep at least one of them in your deck to respawn next round and then again monster nest him. If you manage your nekkers carefully, you can make them last for three rounds.
I found it very easy to get two 2-0 wins against a lot of decks. The combo of tons of nekkers + Arachas feeding Vrans will get 100+ strength on the board in no time. You will easily outnumber even SK wounding or other high number decks. Having Ekkimaras and Vran warrior on other rows than the nekkers allows you to space out your strength across the board, protecting you from a lot of removal.
The reason im running Dagon is that you only ever lose to all-in monster weather decks. Dagon allows you to have a additional clear skies to be safe, and being able to rally a vran warrior or Arachas behemoth is very important in other matchups.
You usually want to have a nekker already buffed before monster nesting him to offset his strength from the spawned nekkers and scorch protect them.
I have been tearing through ranked with this deck today, only losing a few games to Weather monsters (still had a positive winrate against those and only dropped 2 out of 20 games to other factions).
I went from rank 7 to rank 12 today, and didnt face anything that could really deal with this deck.
Things to swap out/experiment on: The harpies are solid, tho i feel they are expendable. I will try switching them out for something else. Maybe Thunderbolt or Blizzard potion or even a few removal spells.
The ekkimaras seem to work, but im not sure if two are really neccessary. Renew can be amazing with Kayran, cause consuming three times will equal 20-30+ strength if you have arachas and Nekkers set up. It also does well into skellige to renew Caretaker and steal their goodies. However, i feel like it can probably be switched out if the need arises, further testing is required.
What do you guys say? What would you change/experiment with? Where do you see the holes and errors in a deck based on this archetype, do you think it will be countered easily once people know it better? I cant wait to hear your opinions.