Use Item Ability: If you have item cards in play (items are like equipment or artifacts that stay in play), you can use any abilities they have, according to their text (some might require exerting the item)
Double strike cards are most common in white and red, although certain artifacts can give other color creatures double strike too
(2004-10-04) The choice of which card to name is part of the resolution of the spell or ability which puts Booby Trap onto the battlefield
If not, I have some bad news: this set will be around for a long time because Wizards of the Coast has declared that cards in this set will be Standard legal for at least five years
While I think it's fine as a one-of, when I play the deck again, I will probably just add in another removal spell
Things that are more trustable. There are dozens of other ways to buy Magic in various packages, but booster packs and boxes are the most common