Braying Gor

Action: Corrupt this unit to lower the cost of the next Choas unit you play this turn by 1 (to a minimum of 1.)

Is ist possible to corrupt Braying Gor in Phase 0 (Beginning of the turn), uncorrupt it in Phase 1 (Kingdom Phase) and then corrupt it again to accumulate Braying Gor's effect?

Yes, there is nothing wrong with that.