Who would have thought cheating would inspire an actual game mechanic?

Actually, this is part of the game as it currently is. Watching gambling anime (specifically, Kaiji) showed me just how much depth cheating adds to a game when both players are aware of the tactics. To mirror this without the actual "cheating" portion, these cards are very blatantly marked. I couldn't convey it the best in black and white, but the card backs are different color and different styles. For example, one card back looks like green leaves, one looks like red earth, another looks like charred, brown parchment, etc. Medrash explains it well. The card backs are associated with 5 cards each, 1 of each element.