Cardevol

First off, this game probably won't be that fun, but most of the time history isn't.  This game mimics evolution by the use of cards.  The goal is to get to humanity (yuck), from plants.  Aces (plants) are the start of the game, and kings (humanity, again, yuck) are the end.  

Every two of a card equals the next card in the hierarchy.  So in the beginning you should have 4 plants = 2 fish = 1 shark (4 aces = 2 ones = 1 two).  The game stops there, unless you have another deck of cards.  If you do, numbers less than the highest evolution can be added to the starting deck to continue the evolution.  So 4 more plants.  (The next deck of cards you receive you'd be able to take 4 plants and 4 fish, or just 4 fish, or just 4 plants, or any other combo.)

If you don't have another deck of cards, you must acquire the cards from any other method besides purchasing a deck.

This will (hopefully) be a very long game, just like evolution is an extremely long process.  By the end the cards should look much like a number tree, or the tree of life if you wanna get fancy.

1. Plant
2. Fish
3. Shark
4. Frog
5. Dragonfly
6. Lizard
7. Dinosaur
8. Chicken
9. Archaefructus (flowering plant)
10. Rat
11. Mammoth
12. Monkey
13. Human