Enchantment creature

Enchantment creatures are both enchantments and creatures and therefore the rules for both apply to them.

History
The earliest enchantments that could become a creature as well were Still Life and Testament of Faith from Odyssey and Halcyon Glaze from Ravnica: City of Guilds. The type line Enchantment Creature was then introduced on the futureshifted card in Future Sight called Lucent Liminid. Enchantment Creatures later reappeared as a full-fledged mechanic in the Theros set, where they represent the gods themselves and their creations and emissaries (creatures with bestow). The enchantment creatures were highlighted in the following set, which was named after them Born of the Gods. These had all global enchantment effects.

The Nyx frame
Enchantment creatures and enchantment artifacts in the Theros block all have a unique card frame that shows the starfield of Nyx. The Nyx frame doesn't have any rules associated with it. It's a reminder that these creatures and artifacts are also enchantments. Other enchantments in Theros use the regular card frame.