Luffy and Yamato starter decks: tips for new players 

Black decks have a lot of cards that reduce the cost of opponents cards and once they’re lower they can be KO’d with cards that target characters that cost the amount you lowered it to. So say your opponent has a character that costs 5, they payed 5 don to play it. You have a card in your hand that can ko a card that costs 1, in order to use it on that 5 cost character you need to lower its cost by 4