EV of sidebet on Party

[Arnfinn Madsen]

Hi,
I found a leak so that I can withdraw my bet after the cards are dealt. I can't bet after the cards are dealt, but I can beth both, and then withdraw 1 or 2 of them. In Omaha, how many of the cards do I need to know to make it +EV, how skewed does the distribution of those cards need to be?

P.S. I am not going to do it since exchanging information about color of cards is against T&C, just curious.