Bombardment card
A card like sanctions but instead reduce a player income, reduce a bonus to 0 armies per turn or the half or any value(in %) and also you cant attack to/attack from any territory of that bonus
This can be implemented as a mod. See https://www.warzone.com/wiki/Mods for details of how to create mods.
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RvW commented
Idea originally posted in http://warlight.net/Forum/Thread.aspx?ThreadID=3492
Further discussion can be found there as well. One item I'd like to mention here is an alternative name: "Sabotage"; this seems to describe the effect better and also prevents confusion with another new card suggestion also called bombardment (but which has a different mechanic).