Shaco Ult "Hallucinate"
Target champion sees all champions as Shaco for x/x/x seconds. Shaco sprites all lose health/resource indicators and only have movement and standing motions (to assist with confusion, because obviously if you see 4 shacos beating on one, you'd know which is the enemy). In addition, target hallucinating champion is no longer able to differentiate between ally and enemy champions, gaining the ability to assist or damage any champion in range.