The two most commonly used "Shaddoll" boss monsters are "El Shaddoll Winda", who is easy to Summon (since most "Shaddoll" Main Deck monsters are DARK) and has a powerful floodgate effect, and "El Shaddoll Construct", whose non-once per turn on-Summon effect generates massive amounts of advantage
This limited availability translates to premium pricing, with Black Label cards selling for 3-15 times more than standard BGS 10s [1]
C Common MR Mosaic Rare Zubaba Knight X EARTH Level 3 [ WarriorEffect ] ATK 1600 DEF 900 At the start of the Damage Step, if this card attacks a face-up Defense Position monster: Destroy that monster
These contain no booster packs, making them the pure gameplay entry point into the anniversary celebration
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Its kind of a complicated behind-the-scenes process, but essentially DVs are hidden values in the game data that determine a Pokmons maximum stats