If you don't have secret pass, you can use some piercing damage like Fairy Meteor Crush and Big Bang Shot. The closest one to Secret Pass is Shooting Star Bow Ceal, but it reduces your attack to 1000. You need to have at least 11000 atk power for this card to work.
i never tried farming may, but for others i use bewd with burst stream of destruction to clear the field(kaiba level up reward), or if you use magicians united to get vessel to 3k you can use cross attack to attack directly.
i use this combo, set one gandora when you got 1 card on top of your deck. Pro: you can destroy any thing that may break your combo, it annihilates traps, insta spells etc. your assestment will be more than 9000, because you may eternal activates gandora effect, cause Northwenko cant be destroyed if you targeted gandora when ritual summon her. Con: destroy 7 cards on the field.