I printed at 15% infill, cubic and didn't use supports or any brim. Just set a pause at layer 9 to switch from the appropriate Wonders color to White with Ironing On and finish the print. For the die, no ironing or pause is needed. Paint the Star any color your want (if you want).
The author remixed this model.
I added a Star on the 8th side of the die which is meant to be used as a wildcard. I also made each of the Wonders myself in Tinkercad recessed and colored appropriately without needed an AMS. Just mark a pause at layer 9 to switch from the color to white.