Here be very functional dragons. Give it a Mullvad ID and you'll end up with a nice proxy pool. It will download all the WireGuard configs, make a few tweaks, find the fastest one based on ping, connect (requires wg-quick) but without using AllowedIPs 0/0 so your internet will continue to function. It'll then run a rotating proxy server that makes use of Mullvad's unique and rather wonderful SOCKS5 facility.
WARNING: This script contains binaries, lions, tigers, and bears. For sure it's packed with malware.
Arguments: MullvadID: Your Mullvad account ID.
You're gonna want jq, wireguard, curl, bash, new/working gost and maybe some day the source for the speed measurement thing.
ulimit -SHn 999999