Tip: If you give a Muncher tile custom graphics, it will still act like a coin when a silver P-switch is active, whether it looks like a coin or not. So make sure to use ExAnimation if there's a silver P-switch in the area.
This patch will overwrite an existing sprite and turn it into the poison mushroom instead. Note that you shouldn't reapply this patch to the same ROM after changing !NUM as it will NOT remove the previous insertion.
Available sprite numbers: 12, 69, 85 (Default), 96, B5