 located near Indianapolis.  Oh and recently got to take an introductory flight on a 2017 Twinstar Diamond NG, beautiful aircraft, twin engine, carbon fiber body, this was at Clearwater Airpark near Tampa, Clearwater beach.  Reach for the sky!!!!!Welcome back to Rules Processing!
I guess I better address the tiny elephant in the room: my AR! Yes, it’s quite a bit outdated now. There are a couple of reasons for that, and I could probably just write “COVID” and that would do, but it’s not one thing alone so isn’t that straightforward, however it is on me regardless, and I do have plans, not just to update it to be current, but also to try and make it more viewable online, and add in some extras like a glossary and maybe some other things. My ambition is probably my own undoing in part, but worst case I update it as often as the real Comp Rules, and still have a more complete document in the end, and if I didn’t, well I wouldn’t feel the need to do it any more! Anyway, enough about that shit, let’s talk about multi-select.
What is Multi-Select?
First and foremost, multi-select isn’t an official term. I’d sure like it to be because it does a good job of defining what it does for the most part. As yet though there is no actual official term so it’s sort of the wild west when it comes to this, with probably the most popular other option being the term “modular.” I’m against this for two reasons.
Firstly, it’s already an actual keyword ability in Magic. Now, you could make an argument for why that doesn’t matter, sure, and given how the ability works, it probably wouldn’t translate well to FFTCG, but with that said, I still personally would prefer avoiding using an unofficial term when it exists officially in a very popular card game. The other reason is that multi-select stands alone better. “Modular” as a term tends to almost demand another word. “That’s a modular Summon.” “That’s a modular ability.” and so on. Whereas you can just say “that’s multi-select.” Multi-select just feels more stand-alone as a term. I mean, yes, technically it is two words to modular’s one meaning it technically balances out, but the real hidden third point is I like it more, so I’m using it.  You can choose to stop now if you like.
With that settled, let’s get into defining what we’re talking about!
When you cast a Summon, use an action/special ability, or when a triggered auto-ability is being put on the stack (that is a multi-select effect), the first thing you do is declare your selected actions (before paying any costs to cast the summon or use the action/special ability). For example, take a look back at Glasya Labolas (5-032H) again. Glasya allows you to pick up to 2 actions out of the 4 available. So you could for example pick the option to choose a Forward and dull it as one option, and to choose a Forward and freeze it, as the other. Once you’ve made your choices, they are locked in. No takesies backsies.
An important note before we move on about the multi-select effect on the stack. The multi-select effect is a single effect on the stack. Each action is not separate on the stack, if someone uses an effect to cancel a Summon, and chooses your multi-select effect from a Summon, then it’s all gone, and same thing with an action/special/auto-ability cancel targeting your applicable action/special/auto-ability multi-select effect, it goes bye bye. This also means that it resolves as one effect, but we’re about to get into how it resolves so I’ll stop getting ahead of myself.
Alright, so, your multi-select effect is now on the stack. Assuming it doesn’t get cancelled somehow, we now skip ahead to the part where it’s going to resolve. Unless of course you don’t want to skip ahead like this, and instead want to do some serious roleplay in which I put together a realistic scenario which I will describe in detail on the level of Lord of the Rings, and play it out, step-by-step, including mentioning every time priority is given and passed, all leading to the effect getting to the point of resolving?
Okay, a couple of you ironically said yes, I know it, and I appreciate you, but no.
The first thing that happens when it comes time for the multi-select effect to resolve is to check the targets. If at this point all targets are no longer valid for an action, then that action is removed from the effect and will not resolve (and if there are no legal targets left at all, then the multi-select effect is removed entirely, but more on that in the next section.) Any action that has at least 1 legal target, or doesn’t have targets to begin with, will resolve (assuming there isn’t something that prevents it resolving somehow.) Once this check is done, you resolve each action, and each part of an actions text, in order, as one effect. To be very clear, there is no stopping the resolution at this point, there is no break in between the actions, it all happens in one go (but not simultaneously) in the order written. If one action says dull and freeze, then it dulls first and then freezes. Additionally, even if at this point one action made a target on another action invalid, it doesn’t matter. It will still resolve as best it can, because the time for checking targets has passed.
Now, let’s zone in on that last part, about targets becoming invalid while a multi-select is resolving, and why it doesn’t matter. First I’ll be making up a multi-select effect for one example, and then using a real card for a slightly different example after, but all around the same concept: a target becoming invalid after the multi-select effect starts resolving.
Okay, imagine we picked two actions for a (made up) multi-select effect. One action chooses a Forward and at resolution breaks it. The other chooses a Forward and at resolution deals it 4k damage. The actions are printed in that order, and we choose, for some inexplicable reason, the same Forward for both actions. The Forward is a perfectly legal choice for both when we choose it as a target, and as the multi-select effect comes to resolve, that remains true. The Forward is still there, and still perfectly legal. However, when it starts resolving, the first action breaks the Forward, which means it ends up in the Break Zone (part of the process of being broken includes putting the Character in the Break Zone, if you didn’t know.) So that means when it comes time to deal 4k damage, the Forward isn’t there. However, the multi-select effect doesn’t care. It doesn’t check if the Forward is still valid, it just resolves the 4k… and nothing happens because it tries to do 4k but it’s just slapping the air. 
We’re also, of course, choosing the same Forward for both actions. Before I go on, let me embrace my inner Dora the Explorer and ask, can you see Swiper? Eh…what I mean is… can you guess the result?
That’s right. I am Swiper. And I’ve stolen your time by wasting it with this Dora-bit in my article.
Okay, but for real, if you said the Forward still takes 7000 damage, congrats. If you didn’t, that’s fine, but please make sure to stay behind after class because I’m going to write a very stern letter to your parents/guardians.
To make sure I cover my bases, let me just explain how this works. First, as Ramuh’s effect resolves, we check the targets. Forward is legal, it’s still active and a valid choice, so we’re all good there. First action, dull the Forward. Great. Forward is now dull. Hold on, now the Forward isn’t active anymore? Nope, no time to hold on, don’t care, SMACK SMACK.
Once the initial target check is done at resolution, the targets aren’t checked again. As long as the Forward is still there, it’s going to get dealt 7k damage. Even if the Forward becomes immune to being chosen somehow, like with Trey (3-064H) (more on this card later), it doesn’t matter, because that only matters when the legality of targets are checked. So again, SMACK SMACK.
I mostly kept the previous section focused on the basics and the more straightforward/normal parts of multi-select, but this section is going to take a little journey into the weeds. For example, can you select zero actions? Or what happens if you pick actions but don’t have a legal target for one action, or all actions? These questions and more are what we’ll dig into here.
Note how the initial multi-select text says “select 1 of the 3 following actions” but if you have 5 or more damage, it instead becomes “select up to 2 of the 3 following actions.” This may seem partly irrelevant at first glance, as if it’s just there to give you the option of choosing 1 or 2 actions, for whatever reason. Perhaps you don’t