Workshop

Lizard, very successful, simply very successful.

There are 3 types of kills: death in fire - a meteor shower (strength 1), a gravitational maneuver - banishing a planet from the system (strength 1), and the Roche limit - splitting into pieces (strength 2).

Splitting into pieces.

Agility - once per game, a kill without leaving any clues, no earlier than the 3rd night.

Type - gravitational maneuver?

Ganymede
This is exactly the type of planet.

Type of satellite.

kills regardless of defense

Kills, despite the defense.
The Mafias seem weak to me. Jupiter is strong, but it can collapse, and Callisto can even escape from them, ruining the joint kill. No, the ideas themselves are good, but then the Mafias need to be given some kind of compensation, maybe even two killing Night Actions per night.

Growing experience

I suggest increasing it from a quarter to a third. Is an additional goal chosen?

Virus of life

How many times can it be used?
Against the backdrop of Earth, Pluto doesn't look very impressive; maybe even increase "growing experience" to one half.