local function MG(NAME, DESC, IMG, speed, jump, gravity)
    minetest.register_tool(NAME, {
        description = DESC,
        inventory_image = IMG,
        tool_capabilities = {
            full_punch_interval = 1.0,
            max_drop_level=0,
            groupcaps={
                flamable = {uses=65, maxlevel=1},
            }
        },
        on_use = function(itemstack, user, pointed_thing)
            set_physics_override(speed, jump, gravity)
        end,
    })
end

MG("magic:low_G", "Low Gravity", "magic_lg.png", 1, 1, .5)
MG("magic:high_S", "High Speed", "magic_hs.png", 2, 1, 1)
MG("magic:high_J", "High Jump", "magic_hj.png", 1, 2, 1)
MG("magic:ninja", "Ninja Powers", "ninja_star.png", 2.5, 1.5, 1)