I played in elo
some matches with a Nightmare
deck in different versions. although Estalt
has greater damage and can win against the "great" cards of the game he also can lose quite easily to any power 5 card... Ielena
has good "muscle power" and with fury she can make, as ibtd said, a life difference of 10, sometimes enough to win a match.
also can make a life difference of 9 with fury, the reason I've put Mojo
is based on the idea of a deck where all cards can deal massive damage or gain lots of life points so that the opponent never know what's going to hit him.
On the other hand Dieter
is a decent card and can help a lot against cards that rely upon their abilities. It depends on the metagame, Mojo
is a bit more scary for the opponent but Dieter
can help in many situations.
it's all up to you to test and tweak the deck