Prometheus, King of the Shadows [FOTB-EN063] Secret Rare 2010 Duelist Pack Collection Tin When a face-up monster you

When a face-up monster you control is selected as an attack target

a mutated version of the Insect Queen

it gains ATK equal to the combined ATK of all "Dark Magician Girl" currently on the field and in the GYs

You can only activate 1 "SPYRAL GEAR - Big Red" per turn

Prometheus, King of the Shadows [FOTB-EN063] Secret Rare 2010 Duelist Pack Collection Tin When a face-up monster youSet: Force of the Breaker Card type: Effect Monster Rarity: Secret Rare Attack: 1200 Defense: 800 When you Normal Summon this card, remove from play any number of DARK monsters in your Graveyard. This card gains 400 ATK for each removed card, until the End Phase of this turn.