Board Thread:Disney Magic Kingdoms Discussion/@comment-39698295-20190604151230/@comment-32526072-20190604161028

To answer you:  yes, any tokens you buy will be stored, even if you don't get Rajah this time. That way, if you earn him in the future, you'll have those tokens already to boost you with leveling up. A tip -- do NOT buy the cheapest token (not sure what it is since I'm not playing the challenge). When the event is over, that token will change over to lamps, so any you may have bought will disappear. Better to use coins on the most expensive token you can.

I'd advise not letting your tokens convert to gems. The exchange rate is something like 1,000 coins = 1 gem. Better to buy the two types of tokens you can. You'll get more bang for your buck.