(one's) bag of tricks
1. The items that one has available for use. The phrase originally referred to the items a magician would use for magic tricks. Let's see what I have in my bag of tricks to entertain the baby.
2. The skills that one has available for use. Our new pitcher has a killer fastball in her bag of tricks. She's an ace negotiator, so you know she has a few more surprises in her bag of tricks.