Having once again proven my staggering intellectual superiority over the remaining denizens of Infinity Wars without even trying very hard, I have been assumed the role of harsh taskmaster to weed out those who might yet have some small worth.
To this end, here is my proposed contest:
Design a card that interacts with resources in some way beyond merely having a cost.
For instance, something like Wealthy Noble qualifies. However, something that has an ability that says 'pay 2 resources' is not good enough. 'Lose two maximum resources', on the other hand, would be an acceptable bare minimum to qualify under this contest's rules. The more interesting your idea, the better.