Many people, myself included, have gotten a 5-0 trophy with something very similar to the following strategy
Opposing Hate Common answers to your graveyard-based strategy include Rest in Peace, Leyline of the Void, Grafdiggers Cage, and Relic of Progenitus
The Adventure here isn't great, but it is upside on a Town that can tap for Blue, so a deck like U/G is still likely to play it
In order to make today's cut, you need to be just Black and then draw
But As a Game My experience with Lorcana depends greatly on my opponent
If youre worried about build time (which is usually about 50 minutes), you can mitigate time anxieties by having a baseline done early (i.e., I know Im playing UB because I have Edgar, Sephiroth, Odin, and Ultimecia, Time Sorceress, but should I splash red for anything?)