These are Based Booster and Extension Booster symbol. Usually this kind of booster is mainly composed of reprint from old booster pack. But also got some new cards. For Extension Booster, this series come with 2 rare cards instead of 1 rare card each pack (except Booster 20 in some extent).

Based Booster 1:


Based Booster 2:


Based Booster 3:


Extension Booster:


Extension Booster 2:


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