There should be a final, small prize for getting a perfect in Trials of the Planeswalker. Maybe 5 additional unobtanium or something. That way if you can get the whole thing done perfect you get one little bit extra prize. Give us some reason to do the whole thing.
Or maybe a leaderboard showing who nailed it perfect just for bragging rights? To keep going on that, maybe the last node lets you keep playing until you lose, then it shuts off, but you can rack up unlimited 5 ribbons. Then the guy with the most ribbons when it ends gets 50 unobtanium? Could be really fun!