one piece op 12 booster box Piece: Legacy of the Master (OP-12) : Toys & Games Includes Six Leaders with New Effects One Piece Card Game OP-12

The other reason I prefer this is for theming purposes and visual cohesion

Abandoned Air Temple is an auto-include in our deck

In April 2024, a copy of Black Lotus, considered the most powerful card in Magic history, in certified Pristine 10 condition, was sold for US$3 million in a private transaction and currently holds the title of most expensive Magic card in history

As there is little reason to be sending Harmo to the Extra Deck and as well as the fact that Harmo provides extra Synchro/Xyz Material with its own effect (as well as no restriction on Link Summoning using Harmo), these restrictions do not get in the way most of the time

Perhaps, you can even intrigue them by considering a gift