Resize the Texture2D to fit the renderer size

I am trying make a 2D card game. To dispense the cards, I need to create the cards of the right size, which needs to be calibrated. I need help in scaling the Texture2D to fit the renderer size, which I'd like to be 200x400px. This is the code I have now:

But when the code is executed, the sprite is still of the original size (1080x1920). How can I assign the sprite the Texture2D with size 1080x1920px and scale it down to 200x400?