In short, Green has access to a number of creatures that hit both, such as Reclamation Sage, Acidic Slime, and Conclave Naturalists
Putting these two effects together, the idea is to Summon Lightwurm with its Pendulum Effect and turning it into a DARK like Darkwurm, Synchro Summoning SKDCW and destroying all of your opponent's face-up Monsters
But she's a bit one-note and only fits in one archetype, but she does well there
For those other personality types, you might want to buddy up with someone who simply cannot get this stuff out of their head
All the exercise really did is further prove to me that the value of a card is entirely based on context
Most of the time, this means during your main phase while the stack is empty