You can apply this guide with any images on the Wiki that has no link. For the sake of guide purposes, it's going to go over how to get Card Images- the borderless versions.
Go to the page of the Card you want.
Once on the page, you will see some tabs that hold the image. If you press the tab that says Borderless you will get the borderless version of the card.
Click the image and you will get a zoom of the image, however we're not done yet.
If you hover against the image, borders on the top and bottom will appear. On the top border you will see the file name of the image- right next to that has some text that says See full size image. Click that.
That will open the image in that tab. If you stare at the URL of the image, you will get something like the following