When your opponent would Special Summon a monster(s) while you have a "Shaddoll" card in your hand (Quick Effect): You can negate the Summon, and if you do, destroy that monster, then send 1 "Shaddoll" card from your hand to the GY
But at least its not as bad as their depiction of Absol on the pack art of EX Dragon: (image from Bulbapedia) EX3_Booster_Absol304542 60.6 KB Oh god
Joan+ 1Polymerization+ 1Fire Sorcerer+ 1The Unhappy Girl+ 1Crimson Sentry+ 1Gyakutenno Megami+ 1Wingweaver+ 2Shadow Tamer+ 1Lady Panther+ 1Horn of Light+ 1Elf's Light+ 1Bad Reaction to Simochi+ 1The Unhappy Maiden+ 1Princess of Tsurugi+ 1Goddess with the Third Eye+ 1Darklord Marie+ 1Magic Reflector+ 1Fire Princess+ 1Rain of Mercy+ 1Darklord Nurse Reficule+ 1Goddess of Whim+ 1Guardian Angel Joan+ 1Deal of Phantom+ 1Graceful Dice+ 1Graceful Charity+ 1Injection Fairy Lily+ 1Chorus of Sanctuary+ 1The Forgiving Maiden+ 1Dian Keto the Cure Master+ 1Lady Assailant of Flames+ 1Amazoness Archer+ 1Enchanted Javelin+ 1Horn of Heaven Deck Breakdown Archetype and card type distribution for this list
The cards extreme rarity reportedly led card condition specialist PSA to refuse copies submitted for grading, apparently citing the difficulty of validating their authenticity and the manner in which they had been acquired by would-be sellers
You can obtain the Teal Mask Ogerpon ex (2-Stars rarity) card by opening Fantastical Parade from Fantastical Parade set
Nibelheim Aflame also works well with creatures with Deathtouch, since the Creature itself is dealing the damage to every other creature