Officialy Suggesting the Mob Grinder
Big Funnel made of Machine Casings, if a mob goes in it they get "pulled" down like they would with water. Big Spinny blade at bottom, if mob touches that they get Killed, Blood spraying everywhere, and a Looting 3 like effect for the Drops (More Meat/Wool/Leather ect) and a small amount of Liqified Flesh is made, which then can be used in a Centrifuge for Methane
___________
__ MinecraftSheep_________
_ MinecraftCow____
__
___
_____
_____