I don't have the expansion yet, so I can't read the card (Maya Calendar and Silver Dragon Statue).
1)Pray action: do I have to show the other players what cards I have drawn? This is important for the Mayacalender card.
After the pray action you need to discard the common cards, so I don't think that it makes diference since the other players will see the cards you dicard anyway.
Page 2 from rulebook, second colum, first paragraph: "... After a Pray Action is resolved the Common cards drawn for this Action are discarded."
2)For the Silver Dragon Statue card: Where do those 10 common cards come from? From the hand? From the deck? Do I look at those cards? Can I place them in anyorder I want?
If you post the text of the card, I can try help you