I don't think you necessarily have a bad deck concept. In fact, it has the potential to be downright broken. However, you're not going to do damage fast enough. On the other hand, you're already planning on pitching your hand, so maybe I would consider:
burning vengeance (kinda meh, but your kill comes from the graveyard)
pyromancer's swath (ups your efficiency a lot and your graveyard is your hand)
wrenn and six (retrace seems to be your goal here, getting 1 land back keeps the chain of death going)
life from the loam (how about that retrace thing? Also, dredge can help find key things)
I apologize that I didn't reply sooner, but my computer was having issues.
Elvish piper? It's a cool card for casual, but a complete do-nothing on its own. Cavern of souls is overall better for what it would do (bypassing countermagic) and doesn't eat up a card slot.
Dromoka's command might be worth a look, though I think atarka's command will not be.
I don't know how well your deck plays, but to be honest, as much as I love gisela, cmc 7 is hard to use in this format. I would probably start by dropping her OR running less angels overall and instead going for the eladamri's call package.
I would probably -2 gisela, +1 lyra dawnbringer lord with lifelink, gives other angels lifelink, see a certain archangel for the obnoxious synergy.
-2 aurelia the warleader, +1 sigarda, host of herons (if liliana of the vess shows up consistently enough)
How often is courser of kruphix useful? I would be tempted by cutting 1 of him and running up to 3 bolts/path to exile (mix, all path, all bolt, up to you which you would also get by cutting one of each of the top end boros angels).
The reason I suggest it is because I would worry about being removal light. Currently you only have 2 beast within...that's problemmatic in my mind.
Well, looking at your list, you're not really playing a combo deck that needs myriads of redundancy nor are you particularly fast. In that case, I think eladamri's call is probably better than once upon a time for that reason. It's guaranteed to find the creature you need for the situation.
Does boros charm have any use for you other than the indestructible mode? I know it has other useful modes, but if you're swinging for lethal anyway, double strike may or may not be useful? What I am suggesting is that heroic intervention might be worth a look. It's pretty good too.
One card I forgot that probably ought to be considered if humans are a thing in your meta (they are surely a thing in mine) is generous gift. You already have beast within, but diversity of removal is a good thing to consider.
Speaking of removal, why no path to exile or lightning bolt? Do they not do enough for you? I don't know what your current meta looks like, but premium removal is usually pretty good.
Edit: You asked about volcanic fallout. This is really a tough call. I mean, what are you playing against? If it's still a ton of tokens, faeries, etc. then probably not. If it's a lot of midrangey stuff where the ability to exile a threat is going to wreck them or the ability to pay 4WW and exile all of their threats wins you the game, then winds of abandon becomes the better card.
Eladamri's call is a good tutor, to be sure. That said, does it do what you need it to do? It makes more angels maindeck able. For example, you could consider sigarda, gisela, etc, as the case may be. It takes you from beatdown midrange to toolbox midrange.
Some powerful cards that were printed?
veil of summer is a powerful protection spell...so powerful that it's banned in 2 formats now. Once upon a time is quite similar. It allows a ton of consistency to all sorts of decks with green in them. winds of abandon is a powerful one sided wrath, may be worth it as a 2 of. It's not path to exile, but it can clear the way for your victory
That seems like a ton of equipment. I could see one or two being all you really need if it's just to win. It seems as if it would be more prudent to run just 4 or 5 really good equipment and then other utility creatures. With the crazy ramp you have, a few higher end dragons seem like a good idea. For example, balefire dragon or drakuseth, maw of flames can keep you alive by wiping out your opponents army. Gets better with the equipment you're running, too.
I mostly suggest a few fliers (not too many, but some) because right now you can't beat a moat effect unless you get really lucky and get one of very few removal spells.
It's not impossible, but this is a 40 life format and multiplayer. What specific storm card are you looking to win with? Tendrils of agony, while an excellent card, probably won't do it. Grapeshot likely won't either. Ignite memories might, depening on how your luck tends to run, and dragon storm and empty the warrens certainly would (eventually), but it sounds as if you want to win with spells themselves, not with storming into creatures.
If you're going to win with "storm", then I can only think that for this format, what you really mean is "chaining together a bunch of spells for a win" because that is what storm does. There are some cards that would help this in this format:
I believe whisper, blood liturgist would reanimate 2 creatures repeatedly. Now, you didn't say anything about them being untapped....
to
Also, you're in red. Why does it only have to be a blood artist trigger? I mean, you have purphorous and impact tremors to trigger off of the enters the battlefield stuff.
edit: Nevermind, I thought whisper was a victimize, but it's the other way around.
One card I would consider in this deck is burnished hart. Yes, I know it is unimpressive and costs a fair bit of mana, but your deck seems like it will be extraordinarily mana hungy and the ability to keep recurring the hart (even if only 1 additional time per game), is a lot of ramp you otherwise wouldn't easily get.
Your deck seems a bit all over the place. You run a few of the goodstuff cards for lands like gitrog, tatyova, et al, but there doesn't seem to be much of a unifying theme. For example, if you had a scapeshift in there, I could see cards like ob noxious the fallen, er ob nixilis the fallen and the other landfall payoffs, but I am not seeing a ton of other good land matters cards that win you the game...they just generate value.
For golos ability, I don't know that I like the ability to play on my opponents turns. I mean, yes, you can activate and get some free stuff with the alchemists refuge, but most of your best stuff wants landfall triggers and exiling lands seems bad. Failing that, you don't have a lot of continously awesome tutor to the top of your library. Vampiric tutor, imperial seal, etc. Yeah, I get it, those are expensive, but worldly tutor, enlightened tutor, and mystical tutor aren't too bad and frankly, to the top of the library is precisely where you want it if you aim for his ability. Failing those, something that fits the bill would be liliana vess or bringer of the black dawn. Bringer especially is beautiful in a deck like this.
I guess what I am asking is, what is your unifying theme?
Edit: I stand corrected on the tutors. Everything but the mystical tutor could be seen as awfully darned pricey. My apologies on suggesting expensive cards, but it can help with what you might be trying to do.
Cards that seem like they would be a good backup would include the haunt of hightower and consuming aberration. I have decked many an opponent with aberration and the haunt of hightower just gets huge!
Elvish piper? It's a cool card for casual, but a complete do-nothing on its own. Cavern of souls is overall better for what it would do (bypassing countermagic) and doesn't eat up a card slot.
Dromoka's command might be worth a look, though I think atarka's command will not be.
I would probably -2 gisela, +1 lyra dawnbringer lord with lifelink, gives other angels lifelink, see a certain archangel for the obnoxious synergy.
-2 aurelia the warleader, +1 sigarda, host of herons (if liliana of the vess shows up consistently enough)
Possibly +1 shalai, voice of plenty / +1 angel of sanctions
How often is courser of kruphix useful? I would be tempted by cutting 1 of him and running up to 3 bolts/path to exile (mix, all path, all bolt, up to you which you would also get by cutting one of each of the top end boros angels).
The reason I suggest it is because I would worry about being removal light. Currently you only have 2 beast within...that's problemmatic in my mind.
Does boros charm have any use for you other than the indestructible mode? I know it has other useful modes, but if you're swinging for lethal anyway, double strike may or may not be useful? What I am suggesting is that heroic intervention might be worth a look. It's pretty good too.
One card I forgot that probably ought to be considered if humans are a thing in your meta (they are surely a thing in mine) is generous gift. You already have beast within, but diversity of removal is a good thing to consider.
Speaking of removal, why no path to exile or lightning bolt? Do they not do enough for you? I don't know what your current meta looks like, but premium removal is usually pretty good.
Edit: You asked about volcanic fallout. This is really a tough call. I mean, what are you playing against? If it's still a ton of tokens, faeries, etc. then probably not. If it's a lot of midrangey stuff where the ability to exile a threat is going to wreck them or the ability to pay 4WW and exile all of their threats wins you the game, then winds of abandon becomes the better card.
Some powerful cards that were printed?
veil of summer is a powerful protection spell...so powerful that it's banned in 2 formats now.
Once upon a time is quite similar. It allows a ton of consistency to all sorts of decks with green in them.
winds of abandon is a powerful one sided wrath, may be worth it as a 2 of. It's not path to exile, but it can clear the way for your victory
I mostly suggest a few fliers (not too many, but some) because right now you can't beat a moat effect unless you get really lucky and get one of very few removal spells.
If you're going to win with "storm", then I can only think that for this format, what you really mean is "chaining together a bunch of spells for a win" because that is what storm does. There are some cards that would help this in this format:
to
Also, you're in red. Why does it only have to be a blood artist trigger? I mean, you have purphorous and impact tremors to trigger off of the enters the battlefield stuff.
edit: Nevermind, I thought whisper was a victimize, but it's the other way around.
For golos ability, I don't know that I like the ability to play on my opponents turns. I mean, yes, you can activate and get some free stuff with the alchemists refuge, but most of your best stuff wants landfall triggers and exiling lands seems bad. Failing that, you don't have a lot of continously awesome tutor to the top of your library. Vampiric tutor, imperial seal, etc. Yeah, I get it, those are expensive, but worldly tutor, enlightened tutor, and mystical tutor aren't too bad and frankly, to the top of the library is precisely where you want it if you aim for his ability. Failing those, something that fits the bill would be liliana vess or bringer of the black dawn. Bringer especially is beautiful in a deck like this.
I guess what I am asking is, what is your unifying theme?
Edit: I stand corrected on the tutors. Everything but the mystical tutor could be seen as awfully darned pricey. My apologies on suggesting expensive cards, but it can help with what you might be trying to do.