Reset a Unit and Strengthen it by 3.
- Gwent Update: March 23, 2017 Patch: Mardroeme: Mutagen now resets target unit to a base strength increased by 2 relative to its initial value.
- Gwent Update: Feb 6, 2017 Patch: Mutagen will now be able to target units on both sides of the battlefield.; Mutagen's buff changed from +4 to +3.
- Gwent Update: Jan 5, 2017 Patch: Mutagen will not longer allow an auto-win if a target is not chosen.