Included in the updated demo (link on right) is a complete set list of every card in the game. An examination of the set list will reveal that each faction tends to have one set of numbers that trends
higher. Kingdom is bottom, Monster is top, Undead is left, and Wild is right.
This is from an earlier iteration of the game where the numbers meant things
(i.e. bottom was "Defense," and top was "Strength"--they opposed just like Kingdom and Monster generally oppose).
If you can anchor the game in one direction, having
predominantly one faction is pretty strong. For example, if you were Kingdom
and played first, playing in the bottom middle would anchor the game so that
bottom numbers were often the adjacent side being compared to see if you defeat
your opponent. This strategy has proven hard to implement successfully.
(click to enlarge)