This was a touch/mouse driven puzzle game prototype, I liked the idea of the shape of the puzzle pieces representing the stack effect.

Other approaches I tried:

Have the player deal and stack cards (to avoid auto-layout issues) https://gashlin.net/tests/shuffle/

Animate the execution https://gashlin.net/tests/pinion/

The puzzle pieces were my favorite, but the family and friends who tested it seemed to understand it best with the animation.