Я, как и dzeaman, не вижу никакой причины, почему штырь СО СТОЛА нельзя применять в чужой ход и в чужом бою.

Treasure cards can only be played on your turn or as soon as you get them, except (generically) GUAL cards (any time) and one-shot Items (during any combat). Other cards specifically say if they can be played at any time. WoD is a Treasure card and does not say it can be played other than on your turn.

Прошу прояснить про Сыграть ШЛ (play) и Использовать (use).
Как мне кажется использовать ШЛ(use) можно в любой момент. ибо не сказано обратного.

Treasures – Using Them
Any one-shot (“usable once only”) item can be played during any combat, whether you have it in your hand or on the table.
Other magical items cannot be used unless they are in play. If it’s your turn, you can play them and USE them immediately. If you are helping someone, or fighting out of turn for some reason, you cannot play new items from your hand to the table.

. . . The Wand of Dowsing: You can play it from your hand on your turn, but that's about it. Notice it doesn't have a "slot" requirement so you can play it to the table and use it at any time during your turn. . .