So here's a farming deck I found for Yubel from a little independent Youtuber.
If you have three Vehicroid Connection Zone (or don't have Gold Sarcophogus) feel free to replace it with any generic draw card to help get to Connection Zone faster.
Make sure that Jumbo Drill is summoned in Defense Mode so that Yubel can't burn you to death
If you summon one Jumbo Drill as soon as possible in Def and just leave that until the final turn. Ditching cards apart from your final turn play pieces and the fusion materials for a second drill, on the final turn you can fusion summon a second Jumbo Drill, normal summon Vassal and then go for game.
I'm currently on about 90% win rate, only losing to when I can't get a Jumbo Drill out quick enough. Usually if I draw all three copies of one of the pieces, then the game is over