@adinimys Thank you for you comment :) For the second visitor, it's a bug actually ^^' I hadn't the time to implement a minimum card played mandatory of 3 to validate the omen. It will be implemented for the next patch.
Concerning the "bad cards", yep, I agry. I'll probably change many effects for the future of the game. The original idea here was to reproduce the "black jack" tension, when you know you take a risk at draw a new card. I think a good way to conserve that is to change the objectives of an omen : the game should not judge the absolute result, but the score the player obtained relatively with his given cards. It could give a more resilient game, and more permessive to powerfull positive and negative effects.
For the power, 8 is the good result : 2 ^ (nb played cards + 1). But maybe the description of the card is not correct ? I'm not very fluent in English, maybe the problem comes from here.
And yes, after the third visitor, the game bugs ^^ It will be patched soon :p
I noted your remark about the text. I will increase the speed :)