Nuke Card
Custom card version
This mod, called "Custom card", can only be accessed from the menu; Game -> Mod: Custom Card.
Advantage over using the standalone non-custom card version: you can have both the nuke and the reconnaissance card in the game. Drawback: you have to select the territory to nuke manually. Do not use on a map worth lots of territories
Reconnaissance card version
This version simply adds the nuke card functionality to the reconnaissance card without changing the image. You need to add the reconnaissance card to the game, or else the mod won't work.
Drawback: you can't use the reconnaissance without damaging the territories. You might forget that the recon card also nukes territories.
Advantage: This version is more visible(in the card menu). You can select a territory by clicking it, not by scrolling in a long list. This version slould be used with large maps.