It simply appears to be the remains of a monster with worms coming out of its body
This walkthrough/guide is going to go through Story Mode slowly, unlocking as much as possible along the way to make the road as easy as possible
Instructor Created Deck #153: Madolche Deck Featuring Zoo King Alpha 2 Zoo King Alpha 1 Madolche Mewfeuille 3 Madolche Hootcake 1 Madolche Cruffssant 3 Madolche Magileine 3 Madolche Anjelly 3 Madolche Petingcessoeur 2 Madolche Messengelato 1 Madolche Puddingcess 3 Ash Blossom & Joyous Spring 2 Ghost Ogre & Snow Rabbit 2 Madolche Salon 1 Madolche Ticket 2 Madolche Chateau 3 Called by the Grave 3 Pot of Extravagance 1 Harpies Feather Duster 2 Madolche Promenade 2 Red Reboot 3 Madolche Queen Tiaramisu 3 Madolche Teacher Glassouffle 3 Madolche Puddingcess Chocolat-a-la-Mode 3 Madolche Fresh Sistart 1 Knightmare Phoenix 1 Knightmare Unicorn 1 Accesscode Talker Notes: Special Summon Zoo King Alpha before you use the effect of Madolche Petingcessoeur, restricting your Special Summons

(2) Once per turn, if an opponents monster attacks, during damage calculation, OR, when your opponent activates a monster effect on the field (Quick Effect): You can add to your hand, or Special Summon, 1 Dark Magician or 1 monster with 300 ATK/200 DEF from your Deck or GY, then you can change that opponents monsters ATK to 0
Look closely at the border of your Base Set cards
C Common Skull Dice X TRAP Roll a six-sided die