In my expansion I wanted to try and make rooms more balanced, so I made external rooms! They are like berserk and add slots, but they do go away when discarded. They modify the room deck in a way that make it a bit more fair and gives more interaction with rooms!
So this is my OC, you might have seen already, and she has an alt Art! Basically what she does is a little bit of card cycling, but she can also make disable abilities of her items and give them abilities of other items, she could even do it with strange matter itself!