You can only activate 1 "Swallow's Cowrie" per turn
Level 4 is the most common level for a non-tuner monster in the game, so having these level 4 tuners provides an incredibly easy way to synchro summon for level 8
PRB-01 has had more time on the market, so its prices are more established, while PRB-02 offers newer chase cards including a highly sought-after Manga Sanji
Chief is ran at 2 despite being the only other good maindeck Shiranui because he's not so fantastic in the hand, the main reason he's good is because of his banish effect
At the very least, theyll send their best creatures elsewhere
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