Hey mate congrats! I take it this was at the Objective Secured SHO GC? I'd love to add your deck to the tournaments page on underworldsdb if you don't mind?
To help keep this on topic too, I took a Ylthari deck to a local tournament 2 weeks ago and was the only player to end the day 4-0. I invested pretty heavily into Ylthari herself which can be risky, but still managed to pull a draw in the game where she was assassinated early.
I found 16 Glory was enough here, but each of my games were pretty close. Tome of Offerings probably would have been a good idea in hindsight.
https://www.underworldsdb.com/shared.php?deck=0,N265,N266,N268,N271,N274,257,243,N389,N388,N365,N503,374,N557,N302,348,N476,306,N269,N309,N451,N371,N305,N473,336,330,N467,N485,384,424,N290,N499,331,320,N493