Tzalrek, Imprisoned Horror

Etherealize (If this creature would die, put an
ethereal counter on it instead. As long as this
permanent has an ethereal counter on it, it isn't a
creature.)
Whenever you put an ethereal counter on
Tzalrek, Imprisoned Horror, it becomes an Aura
in addition to it's other types with "Enchant
creature" and "You control enchanted creature.
It gains indestructible and fear." Attach it to
target creature.