Tzolk'in wealth card meaning
This Tile comes from Tzolk'in - the mini-expansion 1 a goodie from Spielbox magazine.

Here is how to use it:


  Bonus Starting Wealth - Cistern
  
  Your tribe has figured out how to draw water out of the surrounding
  soil and and store it in an underground cistern. The ecological impact
  of this feat of engineering harms the other tribes
  
  If you choose this Starting Wealth Tile, you get 10 corn. Each of your
  opponents starts with 1 less corn. (An opponent whose Starting Wealth
  Tiles provide no corn is not affected.)
  
  If you draw this tile when placing dummy workers, it indicates that
  you will play this game with one less dummy worker than usual (11
  instead of 12 in a two-player game or 5 instead of 6 in a three-player
  game).
  
  Help your culture grow and flourish, and the gods will smile upon you.


Note that this mini-expansion is also supposed to come with a monument tile: the Granary.