Everyone thought that they weren't worth it, so no one got them. Most of the people that did get them didn't use them anymore after about 10-20 levels. The main reason for this, is that the really good one, thunderbird required you had fire completely trained, and, preferably, had a mastery in storm. This idea is of mutations, even though the first of their kind were underpowered, is a very good one.
Don't jump on me here. I know that almost everyone at level 90 has feint, and for most that is the only trap they use. I think this is partially why no one got the mutations with traps: they were no where near feint. There is a way however to make them work. Simply use blades in stead of traps, bring the pips way down, and make one for every school. For example, how about an ice mutation spell. Lord of Winter becomes Legend Lord (2 pips, 300 myth damage, +50% moon blade). More spells like that would be really useful.
#2: Sun school accuracy. No one ever gets this and most of the few that did regret it. Maybe it would be nice to have a spell like +30% accuracy, +15% armor piercing, +15% critical. Not sure if this should go after colossal or extraordinary, cause for everyone that trained colossal this would just be awful.
#3: Secondary Schools. My ice realized somewhere around beginning krokotopia that it had very low damage. So I trained storm to trap. It was really really great to be a hybrid of defense from ice, and power from storm. There are only three reasons I don't use it today. 1: Low accuracy/damage 2: No blade 3: No power pips.
Remember how they said exalted amulets were the next step up from mastery? Well why don't we have a final step that gives accuracy and damage of the school, as well as all the school spells from level 48 up.
#4: Polymorphs. The problem here is that like mutations, they become ineffective after a while. We need new, stronger, more training-point-worthy polymorphs.
1: Polymorph Platypus (maybe not) Spells: Storm owl Sirens Storm blade Heck hound Fire blade Rain of fire Guilding Light Satyr Regenerate Solar Blade Colossal Sharpened Blade Primordial Extraordinary Possibly sun damage spell?
Stats: 110% storm damage 90% fire damage 60% outgoing heal 40% incoming heal 150-250 critical 3500-4000 health 35% resist all
Polymorph Protector Balance blade Spirit blade Bladestorm Chimera Sharpened Blade Availing Hands Hex Judgement Ra Colossal Berserk Empowerment Vengeance Punishment Fortify And possible star attack
Stats: 80% Balance damage 40% resist all 50% incoming heal Some balance crit 4800 health
Polymorph Celestian Tower shield Snow angel Lord of Winter Ice Blade Frozen armor? Medusa Myth Blade Celestial Calendar Avenging Fossil Scarecrow Death blade Lunar blade Colossal Sharpened Blade Polymorph Draconian Polymorph Treant Polymorph Icehorn Possible moon attack
I know these are strong but they need to be for people to get them.
Storm owl
Heck hound
Guilding Light
Balance blade
Tower shield
Medusa
Avenging Fossil