one piece booster box japanese TCG: The Adventure on KAMI's Island OP-15 (Japan – KIMSHINYCARDS each with their own multi One Piece Extra Booster Heroines

All the effects of these cards, however, trigger only on play, thus the corner stone of your strategy should actually be the Floodborn Scrooge McDuck, Cavern Prospector that has a passive ability which allows the Player to put a card under every Character with Boost right after they are played

Also compare the colours on the cards

Ancient Cellarspawn is a cost reduction payoff and helps you cast more nightmares

C Common Evilswarm Mandragora X DARK Level 4 [ PlantEffect ] ATK 1550 DEF 1450 If your opponent controls more monsters than you do, you can Special Summon this card (from your hand)

This means that not only can you destroy all their monsters to leave them defenseless, but you can also destroy their spells/traps so nothing can stop your attacks