trying to fit two jank cards into ulalek fused atrocity deck and dont know what to remove.

Im trying to put Sarkhans Unsealing and Ugins Mastery into my Ulalek deck. Sarkhans for a wincon and ugins to make more creatures and cheat some stuff in. I love all my cards so i always have trouble figureing out what to remove and any help will be greatly appreciated.

Also thinking about adding propagator drone but i dont know if its even worth it.

for context this is a more "casual" deck.

https://moxfield.com/decks/-kFmPiHQ7kqUYMUJ6pzEGA