So i was about to start using this deck:
untill i saw that Ghumbo was banned for ELO this week, what should i change in this deck to make it playable?
Don't use it. Nightmare is very weak without either Ghumbo or Oshitsune, which is the case this week.
But i spend almost all my clintz on this deck ;(
Could Nistarok be an option maybe?
That must be a bit disappointing. It is a shame roots don't have a better 4 star, because then you could swap one of them up to a 4 start and replace Gumbo with Kenny. I wonder if Kenny wouldn't be quite good in a deck with 2 solid damage reducers.
Yes, Nistarok is a good alternative to Ghumbo .