Liar's Paradox/Barber's paradoxDue that this paradoxes are about self reference, ad infinitum, it would sound reasonable
a card about self reference (Note that the concept of self reference is similar to fractal, or even maybe nightmare).
It could be something like:
Cost
Effect: Draw a card.
When upgraded
Cost: none of maybe one generic quanta Effect: Draw a card.
A useful card to reduce deck size and have more probability of landing your master plan combos. Just like precognition is used, but without the hand view thing.
The upgraded version looks too string when the zero-cost is used, maybe some drawback could be added.
The problem of the card is that it's not very compatible with the actual concept of entropy (
http://elementscommunity.org/forum/index.php/topic,22136.0.html). It's more pure a mathematical concept abour recursiveness. Maybe it could be moved to another element.