I look around suggestions every so often and I have to say I LOVE this card.
Noticing however, the self-destroy issue, firstly, the amount generated I think should be lowered. Maybe to the equivalence of a Supernova for both Starlit Minx and Starlit Mistress, maybe 3 per element. Immolation \ Cremation poses another issue as well so might I suggest that Starlit Minx \ Starlit Mistress have an alternate form?
We all know Mummy's special ability. Keeping that in mind Starlit Minx \ Starlit Mistress could also change when targeted by Immolation \ Cremation, turning into say:
Starlit Minx + (Immolation) = Starburn Minx
Starlit Mistress + (Immolation) = Starburn Mistress
NAME : Starburn Minx \ Starburn Mistress
ELEMENT : Entropy
COST: 5
TYPE : Creature
ATK | DEF : 4|2 \ 5|2
ABILITY: (Active) Vengence: Upon death, destroys 2 quanta of each element owned by the enemy.