Theros is the first set in the Theros block. Featuring a world filled with characters and locations steeped in Greek mythology, this large expansion (249 cards) is followed by Born of the Gods and Journey into Nyx. This set introduced Enchantment Creatures, which were both card types at the same time. The set also debuted the creature type "god", which required their devotion be met before they could be creatures. Featuring many legendary creatures, the set is very popular for Commander.