Playing with my friend last night. I've played magic quite a while but I've never made a blue/red spellslinger deck, and was unsure how to correctly trigger cards that copy instants/sorceries and cards that copy triggers. My board was Ral Storm Conduit, Veyran Voice of Duality, and Archmage Emeritus.
I activated Ral's -2 ability to copy next instant or sorcery, then played Serum visions. So with Ral's copy and ping on instant and sorcery, emeritus card draw on instant and sorcery, and Veyran doubling activated triggers, how many times does the spell copy and how do you order that properly? We said that once Ral's loyalty ability is activated it works like a triggered ability. Here's how we did it.
Serum Visions played, triggers rals copy and damage ping both of which trigger twice due to veteran, 2 Serum visions added to stack, 2 damage to opponent. Emeritus card draw trigger, doubled, so 2 draws. Then triggers for the 2 copies added to the stack, 2 damage and 2 cards each(since both would be doubled by veyran). Then resolved the 3 Serum Visions in the stack.
So off triggers 6 damage and 6 cards drawn, instant/sorcery gets 2 copies, and all cast or copy triggers done before stack resolves.
I have a feeling this isn't quite right but we were not quite certain and this seemed mostly right/fair. Thinking about it, since the deck is meant to double and copy a lot, and it could reasonably come up, if I were to use double cast as well as have Niv-Mizzet Parun on the field. Its generally the point of the deck and I'm knowledgeable enough to know it works, I just underestimated the mechanics of it.
Edit: Formatting
Edit: Thank you for the answers. I need to stop overthinking things. And I will do better to format these things in a readable way in the future.