Gold foil in my quest rewards

Today I had the death splinter for my daily quest. 6 battles and I was done. I lost the first and won the rest. I managed to get into the Gold league again as I was completing my quest so I got these cards.

I was super surprised as I was playing today because a friend was letting me borrow their gold lord A and it was not there when I was doing my quest so I have to go track one down.