After your Sim is worthy enough to face other Sim opponents to test their magic, have them go to Magic Town. Show off their skills by challenging another Sim to a Magic duel. To do this (if you have not edited the original Magic Town) is to go to Clowntastic Land or A Spooktacular Spot, where there is a Diametric Dueling Device. Have the Sim you want to battle, and click on it. The word "Duel" will appear. Click on it and it will show all the names of people on the lot for you to challenge. Note: You can face the vendors. When you choose the Sim that you want to battle, the dueling begins when they arrive at their post. You get MagiCoins for defeating any Sim. You get more coins the better you defeat them. The following is a list of weaknesses and strengths of the magical elements (White Lightning, Red Wave, Blue Tornado, Black Blizzard, Yellow Brimstone):

The same element against itself is a tie. Do not do this if you want to get MagiCoins from your opponent.
White defeats Blue and Red
Red defeats Blue and Black
Blue defeats Yellow and Black
Black defeats White and Yellow
Yellow defeats White and Red

Note: Facing some of the vendors will give you more MagiCoins than the normal Sims. The maximum number of MagiCoins you can get from dueling is 40 per duel, with a Sim opponent with full logic.