Board Thread:Game Discussion/@comment-10151975-20130528214159/@comment-9573474-20130530115049

i recommend to use all up... sell them for $ or MTM all R3, sounds crazy, but you can actually have more luck then normal time to pull out R4. As for next events, i think you will have enough medals earn to waste them on upgrading, even your rewards card.

may be can try MTM whole fleet of combiners, who knows, one day Contructicons, Predaking, Bruticus will appear and need Trans-scan with 5 of them... hahaha...