one piece 12 booster box OP-12 Legacy of the Master Japanese Display – JapHunter Available June 12 S-Chinese OPC-12 One Piece Booster

Extended Art One Rings cost about $65-80 apiece

While Ruby/Amethyst probably has the advantage realistically in that matchup, its not by a lot and a strong Sapphire/Steel player can certainly overcome Ruby/Amethysts tools either by gaining more cards in hand through superior draw support, or discarding that decks key cards via A Whole New World

If Explorer's Cache isn't on the battlefield as its activated ability resolves, you can't remove a +1/+1 counter from it, so you won't put a +1/+1 counter on the target creature

However, the cost (critically, the fact you need to buy two) and some of the terminology (specifically, the difference between abilities, songs, etc) might be tricky for people who havent played TCGs before

Greasefang, Okiba Boss is the lynchpin here

People will think twice before attacking you if you have Ghostly Prison around since theyll waste precious resources by doing that