That's incredibly easy. Just go fight Level 10 Jaden at the gate, and either let him hit you with a direct attack or two, or use cards like Abyssal Designator to lower your LP. Just keep in mind your LP need to have been lower than Jaden's the turn before you win. (So you can't drop your LP and win in the same turn.)
Just play as always, draw cards until you get aroma gardening and marjoram, activate gardening but don't use its effect, switch your jazmines to atk and let the ai attack you, when you are low in lp activate gardening summon bergamot and with the destroyed jazmine summon marjoram, in your turn you should be able to otk
lv10 duellist will always hold their low attack monsters in atk position so otk them is easy as pie. The "Kachi kochi dragon" you get from the tag duel event help lots with otk too.
OpaH
