When Chthonian Nightmare enters the battlefield, you get EEE.
Pay X E, Sacrifice a creature, Return Cthonian Nightmare to its owner's hand: Return target creature card with mana value X from your graveyard to the battlefield. Activate only as a sorcery.
![Chthonian Nightmare (Retro) [Modern Horizons 3]](http://paradoxtcg.com/cdn/shop/files/59cbd637-30d1-4c3c-95ce-b6c6f9248d15_364a10cb-cb7d-4496-bbe3-451c9d3d6b08.png?v=1776242796&width=1445)
