ToolScript (LocalScript + Stacks)

local Tool = script.Parent

local player = game.Players.LocalPlayer

Tool.Activated:Connect(function()
    Tool.stacks.Value -= 1

    while wait() do
        if Tool.stacks.Value == 0 then
            Tool:Destroy()
            player.Character.Humanoid.Health += 5
        end
    end
end)