Premise:
There's a deep ancient jungle full of critters and beasts of all shapes and sizes, your mc has found themselves in a body of a snake. They need to poison 100,000,000 humans to turn back into one, and twice that to turn back to their original self.
I'm just a snake?
Do... you have any idea how many people 100,000,000 humans is? Like... how many coats I could make with that much skin?
...
Never mind, off topic.
My point is, I was a bill collector, talked to about 100 people a day that's about 3000 people a month, 30000 people a year. And by talk to, I mean unique contacts. Actually got someone on the phone. THIS WAS BEFORE CALLER ID. so maybe I talked to a quarter of a million people in a decade. I'm rounding down here.
So it would take me, calling by PHONE to reach 100,000,000 unique people, FOUR CENTURIES.
BY.
PHONE.
You expect me to PERSONALLY POISON TWO HUNDRED MILLION PEOPLE?
AS A FUCKING SNAKE?
HOW, in the name of all that is holy, am I supposed to make CONTACT with one hundred million people, much less TWO HUNDRED million, if I am only going to live 20 GOD DAMN YEARS?
Here's what I do.
I DIE A SNAKE.
Because that is the only outcome of your silly premise. ANYONE in that situation, DIES A SNAKE. Why even include such an impossible way out?
DEEP IN A JUNGLE?
Let's assume I am the fastest poisonous snake, the black mamba. So on flat ground 12 mph dash, jungle? 3 mph, MAX
I'm deep in a jungle, Amazon judge. So, I got about 2200 miles to reach the edge. Let's make it simple on the math, 1500 miles. 500 hours. I gotta sleep, so maybe 10 hours a day of movement. 50 days to reach anywhere.
ASSUMING I CAN GO IN A STRAIGHT LINE AND WON'T GET LOST.
Do you think a snake, moving in a straight line, 30 miles a day ain't gonna get killed and eaten like... a hundred times over?
TRUTH?
I'd be lucky to eat/sleep and survive and still make progress of a full MILE a day, meaning it'd be about 4 YEARS before I saw the edge of the jungle, MUCH LESS A HUMAN BEING.
Now, will the remaining 16 years of my FUCKIN life I am to fine... 200 million people and POISON them?
There are only 440 million people in South America IN TOTAL.
I AM TASKED TO POISON HALF A CONTINENT?
How? In what fuckin' universe under what fucked up laws of physics is this shit supposed to be even remotely possible?