One basic styling rule for all conrols in WPF

You can't do this, but you can create one style and then use it for other controls.
 
If you have the following Style

<Style x:Key="ControlBaseStyle" TargetType="{x:Type Control}">
    <Setter Property="Margin" Value="50" />
</Style>

 
You can target all Buttons for instance
 

<Style TargetType="{x:Type Button}" BasedOn="{StaticResource ControlBaseStyle}"/>

 
You still need to add the style for each control type, but you can make it so the actual style is only there once.