Augury at the Garrison

Ezren takes a turn and closes out the Garrison. When the Garrison closes, it makes a new pile of cards at that location (even though it is closed) consisting of the armors and weapons in that deck when it closed - in this case 4 cards are left over. Ezren draws Augury when his hand resets and decides to help out his buddies who like big metal objects and he casts it (on another player's turn), specifying weapons. What comes up is a big blank display of no cards at all and the spell is wasted.