Rainbow Dark Dragon [PTDN-EN003] Secret Rare Water or MonsterCard

or MonsterCard

you can apply this effect

Set: Speed Duel GX: Midterm Destruction Card type: Effect Monster Rarity: Secret Rare Attack: 1700 Defense: 1100 Once per turn: You can reveal 1 Fusion Monster from your Extra Deck

Set: Stardust Overdrive Card type: Synchro/Effect Monster Rarity: Ultimate Rare Attack: 2800 Defense: 2000 1 "Blackwing" Tuner + 2 or more non-Tuner monsters When this card is Synchro Summoned

Set: R Manga Promo Card type: Effect Monster Rarity: Ultra Rare Attack: 2500 Defense: 1500 When this card is Tribute Summoned

Rainbow Dark Dragon [PTDN-EN003] Secret Rare Water or MonsterCardSet: Phantom Darkness Card type: Effect Monster Rarity: Secret Rare Attack: 4000 Defense: 0 This card cannot be Normal Summoned or Set. This card cannot be Special Summoned except by removing from play 7 DARK monsters with different names from your Graveyard. You can remove from play all other DARK monsters you control and from your Graveyard to have this card gain 500 ATK for each card removed.