Ok here is somthing that can help if your looking for a certain card.
Start out by going into Free Battle.
If you don't already have a 2nd character make one. Choose your Main Character
(Main) and then the 2nd character (Dummy Character).
When you go to choose your deck with your main character choose the best one
When you choose your Dummy character's deck choose the default Arkz Deck.
Now go to Rules and change minimum roll to 6 and Player HP to 35.
Start the battle. With your main character equip a Sword or Partisan. With
your dummy character equip 6 monsters in 2 rows. Your main character will then
attack monsters untill the dammage you have done 65 Damage total (TO THE MONSTERS
Now go ahead and kill Break. You will have done 100 Damage giving you the S-Rank
and alot of Cards! This is very quick a useful for Rare hunts. Good Luck!