Chthonian Nightmare
When Chthonian Nightmare enters the battlefield, you get {E}{E}{E} (three energy counters). Pay X {E}, Sacrifice a creature, Return Chthonian 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.
Enchantment
standard:
not legal
future:
not legal
historic:
not legal
timeless:
not legal
gladiator:
not legal
pioneer:
not legal
explorer:
not legal
modern:
not legal
legacy:
not legal
pauper:
not legal
vintage:
not legal
penny:
not legal
commander:
not legal
oathbreaker:
not legal
standardbrawl:
not legal
brawl:
not legal
alchemy:
not legal
paupercommander:
not legal
duel:
not legal
oldschool:
not legal
premodern:
not legal
predh:
not legal
High - Low