Conceptual Balance Series (Mod)

Hi there,
May I suggest another minor change in the spells ? Its about Melancholia. Seems very weak in comparison with the other 'artillery' spells like Leprosy or Murdering Winter. Kills 5-10% of the units (IF ordinary units with 10 or 11 MR and mrl, less if elite). Kills 1 or 2 dominion candles. Temporary shifts dominion toward sloth.
Frankly I've never seen this spell in a game, and I even cant imagine any use for the price...
So I suggest to reduce the cost to 10 or 12 gems (instead of 20) and Earth4 (or even 3) as requirement.
Any thought ?