This machine is able to spawnproof the entire world. It consists of 30 statues and 30 1/2 second timers.
When a mob dies or despawns, no mob can naturally spawn in the next game tick. This mechanism kills a statue mob every game tick, so nothing can naturally spawn.
You can use any combination of statues, but it works best if the mob dies instantly. If you are using a statue of a mob that doesn't die instantly, spawns will only be prevented if you are at least 250 blocks from the machine. Note that during a blood moon all bunnies, penguins and goldfish will turn into their vicious/corrupt versions and will no longer be instantly killed by lava.
In DDU and GFB seeds lava cannot instakill any mob.
All bunnies become explosives bunnies in FTW and GFB, which may make it difficult to turn the machine off.