Monastery - based on rules: For example if you have gained three cards, you may trash up to three cards, with each being either a card from your hand or a Copper you have in play, in any combination.
But on site I wasn't able to do combinations. (In my situation I could trash up to 2 cards, but it did not allow me to trash 1 copper from play and 1 estate from hand)
But on site I wasn't able to do combinations. (In my situation I could trash up to 2 cards, but it did not allow me to trash 1 copper from play and 1 estate from hand)