Casualty, Rowan, and Double Vision all work the same way. There is a trigger that says "When you cast the spell [under additional circumstances], copy it. You may choose new targets for the copy." They trigger caused by the same thing. The Madness triggers as you pay a cost for Big Score, but, since that happens while casting Big Score, that trigger is also thrown in the pile with the others at the time you finish casting the spell, as "the next time a player receives priority", to be placed in an order on the Stack.
As such, you can put all four in whatever order you want, so long as it's all on top of (the first) Big Score.
The Stack you've diagrammed is not a possible state you can end up in, since any Big Score copy would always be the top thing on the Stack at the time it exists.
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Initially, the Stack would have the original Big Score at the bottom, followed by four triggers (madness, and three copy triggers, one of which conditional on you paying mana when it resolves) in the order of your choosing. If you have the 2 available to get a copy from the Rowan emblem without using any of the treasures, then yes, you can get 6 mana from 6 treaures created by 3 copies of Big Score before madness gives you the opportunity to cast FUtFb. Which is only enough to pay for an X=4, though, as you need an additional BB for that spell.
Note, that casualty is like replicate or storm: if the cost is paid, it creates a trigger that will eventually give you a copy of the spell when it resolves, not immediately.
Sorry if something was not clear in the way I laid it out, but I was in fact attempting to illustrate a situation where all four of those triggers were arranged on top of the first instance of Big Score. Thank you for helping clear this up for me.
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The thought here is I should have 6 treasure to dump into that X. Is this right? Thanks in advance!
As such, you can put all four in whatever order you want, so long as it's all on top of (the first) Big Score.
The Stack you've diagrammed is not a possible state you can end up in, since any Big Score copy would always be the top thing on the Stack at the time it exists.
Awesome avatar provided by Krashbot @ [Epic Graphics].
Note, that casualty is like replicate or storm: if the cost is paid, it creates a trigger that will eventually give you a copy of the spell when it resolves, not immediately.
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