Entity Filter Card show 2 different attributes

Hi there

I’m pretty much a noob when it comes to home assistant and it’s scripting for cards and so on, so I apologize if I’m asking something very trivial.

So what I want basically is a card to show the steam wishlist normale price if it’s not on sale and the sale_price if it is. I’ve tried multiple version of the following, which obviously does not work.

type: entity-filter
binary_sensor: binary_sensor.steam_wishlist_cult_of_the_lamb
  - "True"
    attribute: sale_price
  - "False"
    attribute: normal_price

Is there even a way to do that?