Copying “prepared” trigger | tcgmode

If I have \[\[Emeritus of Conflict\]\] and \[\[Veyran, Voice of Duality\]\] on the battlefield and I cast my third spell (assume it’s an instant or sorcery), can I cast Lightning Bolt twice in a turn by reacting to the last Prepared trigger on the stack? Meaning: Third spell -> Emeritus Prepa...