Griefing Client
So basically I want to make an extremely simple griefing client with only instamine. I can code instamine through both a superpickaxe or just setting every hardness to 0, but I don't know how to use the clientside minecraft mod (which is installed in my minecraft.jar) to effect other peoples servers. I tested the mod in my own server and the blocks just respawn when I try to instamine. Is there any realistically simple way to fix this or am I way out of my depth here?