Leo: Good for final pushes and Ash/Brimstone Eaters. Brittle, but well, Fire.
Aries: Cheap, reusable Normalizer. Breaks any buffing deck, so growing creatures and Paradox-like builds go down, but useless against some... guess it's fine.
Scorpio: Neurotoxin should be a SPELL, cost 5-6
, and do what it does, and NEVER EVER be a creature ability. Scorpio as it is now is no way.