MTG Salvation

I need help with something here. Playing a commander game with a friend. Him using Volrarh, the Shapestealer. Me using Jeleva, Nephalia's Scourge.... With Jeleva in play he summons Volrath, then enters combat to put a counter in Jeleva. Exits the combat phase without any action goes to the next main phase and activates the ability to copy Jeleva. All this I understand and get. However when becoming the copy he claims that since he spent5 mana on volrath which is now Jeleva, her copied ETB effect takes place and I exile 5 cards from my library. Can someone please explain how this is possible?

I need help with something here. Playing a commander game with a friend. Him using Volrarh, the Shapestealer. Me using Jeleva, Nephalia's Scourge.... With Jeleva in play he summons Volrath, then enters combat to put a counter in Jeleva. Exits the combat phase without any action goes to the next main phase and activates the ability to copy Jeleva. All this I understand and get. However when becoming the copy he claims that since he spent5 mana on volrath which is now Jeleva, her copied ETB effect takes place and I exile 5 cards from my library. Can someone please explain how this is possible?

I need help with something here. Playing a commander game with a friend. Him using Volrarh, the Shapestealer. Me using Jeleva, Nephalia's Scourge.... With Jeleva in play he summons Volrath, then enters combat to put a counter in Jeleva. Exits the combat phase without any action goes to the next main phase and activates the ability to copy Jeleva. All this I understand and get. However when becoming the copy he claims that since he spent5 mana on volrath which is now Jeleva, her copied ETB effect takes place and I exile 5 cards from my library. Can someone please explain how this is possible?