one piece carrying on his will booster box [op-13] 12-Box Case The Theme for the Coming 3rd Anniversary is the Three Brothers Carrying on His Will OP-13

The side deck can be a maximum of fifteen cards, and the extra deck can also be a maximum of fifteen cards, so overall youre going to have a minimum of 70 cards and a maximum of 90 to sleeve up, so make sure that you get the sleeves that suit your deck the best and actually fit your cards

You can only activate 1 "Level Resist Wall" per turn

Cards similar to Behind the Scenes include Spitfire Handler

Sorcery Deliver Unto Evil Choose up to four target cards in your graveyard

Basically, for a flashback card to be playable, the front half either has to be close to on-par for its effect, so the flashback aspect of the card is a bonus / afterthought, or the reward for getting the card in the graveyard is good enough that you don't mind building around a card that's not that great in your hand

Remember, you just need 30 tokens to unlock a priority redemption for a premium ME5.5 item (like the ETB)