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This is because you arent actually casting the copy, which is what prowess cares about

The loss of life Jerren causes isn't exactly optimal, but you can easily offset this downside for two mana, Jerren can provide a target Human with lifelink until the end of the turn

So long as we make sure he doesnt get killed in combat, stuff is going to happen

or unattach from a creature

A good inclusion for Commander equipment decks

Ive won games against Elves through cards like Quirion Ranger and Wirewood Symbiote because the Staticaster activations were staggered over the course of multiple turns and have pitched Izzet Staticaster to Force of Will