I was thinking of merging up the death knight since it’s the month of spookiness and BONEZ. If I do decide to merge him, I might wait for the extra copy from the GHB revival for him. I am also planning to give him distant counter when I start building him.
As a side note about 3H, I was able to beat the death knight when he appeared a second time! Lysithea had a spell which let me one shot him!