Play as Yuri in a team game and set "Build off ally con yards" on. Then build all structures required to produce the mastermind. Then build 1-2 and send them into the base of one of your allys. Then build a grinder in their base and the use the mastermind to mind control some of his units and send them into the grinder for easy money(be carful not to do more than 3 mind controlled units at a time) have fun, free money, win the war!