Mutations are special modifiers that can appear on ANY baddie. They change appearance and, more importantly, can drastically increase stats and value.
+200% to +500% Stats
The "Jackpot" mutations. Usually found on The Virus or special event baddies. Makes the unit giant and glowing.
~2x Stat Multiplier
Green, crystalline texture. Extremely desirable for trading. An Emerald Epic often beats a base Legendary.
~1.75x Stat Multiplier
Blue/White shiny texture. Excellent boost for mid-game baddies.
~1.5x Stat Multiplier
Solid gold appearance. A reliable upgrade over the base version.
Variable Boost
Rapidly changing colors. Often purely cosmetic or minor stat boost depending on the specific patch.
No Stat Change
Makes the baddie see-through. Cool for collectors, but provides no Money/s advantage.
Many players auto-delete "Common" or "Rare" baddies. This is a mistake!
A Common Baddie with a Titanic mutation can easily outperform a base Epic or even low-tier Legendary.
(Placeholder comparison: Base vs. Emerald)