Oil slick cards are certainly a highlight of this product, and are the primary factor for the increased cost (16/03/23). Unlike the other cards in this product, the oil-slick cards don't show signs of curling. The foiling process is similar to the Kaladesh inventions (a plastic-like quality). If possible, buy only Japanese-printed MTG cards. The quality is far superior, both for curling and centring. AFAIK the collector boosters were the only product from this set printed in Japan.
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