Welcome to the Official Redemption® Message Board!
I'm not sure if Moses is able to negate cards that are no longer in play. Anyone else care to answer? (this is of course a sidebar the original question, as pretty much everyone I know agrees the placed enhancement comes somewhere after the hero's SA.)
While I don't think anyone thinks it does, if the enhancement was to activate before moses's ability, it'd be discarded before he could negate it.
What if i put Highway on ... Israelite Archer? Could I discard an EC, and withdraw unharmed?