Reinforcement Income Defection Card
A card that causes a percentage of a selected opponent's income to 'defect' to you.
Likely best played at or near the bottom of the order stack, taking effect at the beginning of the next turn, this card would allow the player to nominate an opponent, whose income would become your income. Game settings specific to the card would be to set what percentage of armies defect, to allow the card to be completely effective or only partially so.
This card should be calculated after the sanctions cards (i.e. playing against a sanctioned player would be ineffective, receiving sanctions yourself would still allow defections to occur). It could possibly allow third party defections (from one player to another but not involving you) in a manner similar to sanctions.
Although the card can be played by anyone, in any situation, this card would act as an equaliser. Between mismatched opponents, one with a large income and the other a small one, the player with a lower income himself will see a larger benefit than the other player, by virtue that there are fewer reinforcements to 'steal'. In equal situations it may help tip the balance of power.