Yu-Gi-Oh! Worldwide Edition: Stairway to the Destined Duel promotional cards

Introduction
The Stairway to the Destined Duel Promos, are a set of 3 Prismatic Secret Rares cards that came with the video game Yu-Gi-Oh! Worldwide Edition: Stairway to the Destined Duel. There was two different sets of promos for North America and Europe.
Set Specifications
File:SDD-Box-EN.jpg	File:CAN.png Set Name: Stairway to the Destined Duel Promos Set ID: SDD TCG Release Date: TCG Set Size: 3 Cards TCG Breakdown: 0 Normal, 2 Effect, 0 Ritual, 0 Fusion, 1 Spell, & 0 Trap TCG Rarity Breakdown: 3 Prismatic Secret Rare Stairway to the Destined Duel Promos TCG Gallery
File:SDDE-Box-EN.jpg	Set Name: Stairway to the Destined Duel Promos Set ID: SDD TCG Release Date: TCG Set Size: 3 Cards TCG Breakdown: 1 Normal, 0 Effect, 0 Ritual, 3 Fusion, 1 Spell, & 1 Trap TCG Rarity Breakdown: 3 Prismatic Secret Rare Stairway to the Destined Duel Promos TCG Gallery

Spoiler Card List
File:CAN.png SDD-001 Valkyrion the Magna Warrior SDD-002 Sinister Serpent SDD-003 Harpie's Feather Duster		File:IRL.png SDD-E001 Seiyaryu SDD-E002 Acid Trap Hole SDD-E003 Salamandra