Quote from DementedKirby »The Obzedat player was locked out of using his commander when the Damia player cast Trickbind in response to Obzedat returning from exile. So Obzedat stayed in exile. Without ever changing zones, it couldn't return to the command zone. Once that happened, I knew my threat was going to be Damia.
Pretty sure Obzedat is like Norin where when you exile him you can instead send him to the command zone and his trigger will put him back in play as long as he doesn't change zones again.