I have an artboard with a card design and I have an image that have to change one hundred times inside that. It´s an image that changes the meaning of the card, but it will always have the same width and height. Those images are a JPG file, that I will place on that card design AI file.
Is there any solution without using one hundred different layers? Like an action?
Not in Illustrator, but InDesign would let you do this pretty easily. Any repeating elements could be added to a Master. You could even use dynamic data to import those images if you have them in a list somewhere.