Ethereal Nightmare

Celestial - As long as you control less than five enchantments, Ethereal Nightmare isn't a
creature.
Whenever Ethereal Nightmare enters the battlefield or deals combat damage to a player,
exile the top two cards of your library face down.
{x},{t}: You may cast any number of cards exiled
by Ethereal Nightmare with converted mana
cost X or less without paying its mana cost.
The unease on Theros transformed the
creatures born on Nyx