I just got my UA from getting Plat in the qualifiers because I wanted to farm the events since I didn't get any Dimensional from Paradox and this is the next event...
Sudden regret over not picking CV or Econ since I hate farming Kaiba
I also got my 1st UA after reaching Platinum 1. This time, I'm looking for my 2nd UA. Bro, don't regret confirming UA since it will help us a lot with farming LDs. BTW, I hate farming Kaiba too. Hope we get the cards we need!
You should farm LDs to get the skill. This character's skill Element Unite can farm most of the LDs. And the skill Labyrinth Builder is very useful also, can farm almost LDs including Kaiba lvl40 very easily, I won him more than 90% rate with 8K assessments, unfortunately I was done getting all of his rewards long time ago.
No need to think that far man. Level 30 can be clear using dinos and dinosaur kingdom. As final blow, use chu, fusion monster brachio and either vassal or piranha. High score is guarantee then. Here is an example.
However, Level 40 is different story since yugi has that golem and spinxh which bring major headache. Last time I use jbm but since it is not consistent (in term to get jbm on 1st draw) now I plan to use something else. I share with you once I test it few times.