Yu-Gi-Oh! - Thestalos the Mega Monarch (MP15-EN021) - Mega Pack 2015 - 1st Edition - Secret Rare A single individual card from the Yu-Gi-Oh! trading and collectible card game (TCG/CCG). This is of Secret Rare rarity. From the Mega Pack 2015 set. You will receive the 1st Edition version of this card.