5 card draw with for exampel Dwarf Cannon Crew

By gertat, in Warhammer Invasion Rules Questions

If you play a card that let you search the top 5 cards in your deck and pick a card to play like Dwarf Cannon Crew.
http://deckbox.org/whi/Dwarf%20Cannon%20Crew

Do you draw all 5 simultaneously and choose the one you want if more than 1 i "legal"?
or
Do you draw one, see if it is "legal" and if it is, you dont get to search the remaining cards.

Thanks for the great support.

Do you draw all 5 simultaneously and choose the one you want if more than 1 i "legal"?

This.