Namely, the ability to make each of your lands produce an additional mana every time you tap them
OP-13 marks the thirteenth mainline expansion in the One Piece Card Game series, introducing new character cards, gameplay mechanics, and deck archetypes from the ever-expanding One Piece manga and anime universe
It has since been reprinted as a $300 judge promo, an $800 Kaladesh masterpiece and as a mythic rare in two of the most expensive Masters sets ever
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Upgrade 10 The last card that I am adding is Warleader's Call, a nasty little enchantment that will allow you to get chip damage for all your creatures entering the battlefield including the tokens generated
Eight other promo cards have been listed, though a few others from the Japanese set have not yet been confirmed