It can't get any rarer than this - when only one copy of a given card exists, you know it's uniquely special
As a result, Be Prepared is played in just about every single Ruby deck
How to build a One Piece Card Game deck One Piece Card Game setup One Piece Card Game rules How to win the One Piece Card Game Can you play the One Piece Card Game with more than two players
This is obviously dead and unplayable in EDH outside of grabbing five new basic lands, but there are far better ways to have the same effect with less cost in the format
The best option would be to do both sleeve and topload your MTG cards
For specific match-ups, this is how Ive been sideboarding with the current list: Mono-Red On the Draw: -1 Shanna, Sisays Legacy, -3 Song of Freyalise, -2 Trostani Discordant