Bernard
You must trash cards from your hand that have a total cost of $15 or more in order to sway this.
You may trash a single card as long as its cost is $15 or greater.
The cards that you choose to trash must be in your hand. You cannot trash cards from your YARD or GARAGE to pay this cost.
You can trash any kind of cards to pay this cost. Bernard isn't picky.
When scoring, this is worth 5 VP if it's in your Sway.