Play an Allies against Soviets skirmish. If you infiltrate the Soviet battle lab and barracks with a spy you will get a new unit. This new unit is called the Psi Commando. He is like a Yuri except he can chronoshift and blow things up. Basically a mix of Yuri, Chrono Commando Nad and Crazy Ivan. This unit can be very useful in every way. Control something, place a bomb, blow up a base and then shift back home. A very devastating technique!