Nicol Bolas wasn't typically portrayed as being afraid of Yawgmoth in the novels. His personality is too bold and dominant for such fear. He might strategize against Yawgmoth but not out of fear.
Nicol Bolas is the main antagonist. And then there are many other planeswalkers like Chandra Nalaar, Jace Beleren. The guild leaders in Ravnica also play important roles as they are involved in the conflict on their home plane.
Well, in the Nicol Bolas War of the Spark story, Nicol Bolas is like the big bad. He has this huge ambition to rule. Ravnica is the main stage. Planeswalkers from all over come together. Some are there to protect Ravnica, some have their own motives but end up fighting against Bolas. There are magical duels and strategic battles. The story is full of twists as different characters' powers and loyalties are tested in this all - out war for the future of the multiverse.
A yeti animated cartoon might feature a big, furry yeti with a friendly or adventurous personality. The animation style could be colorful and the story could be set in a snowy or mountainous landscape.