I've seen a list like this before and I never got what you're supposed to get out of the temple garden. I ran a similar list and did okay at FNM. I actually like cedric phillips list from a few SCGs ago. It's more of a jund aggro but I think it can be easily modified to just RG. IIRC he was actually running it as a red green and splashed black at the last minute. I think domri is a good fit for this kind of deck too. If you've play tested you're deck and you're comfortable with it then a drastic change like this probably isn't recommended.
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For your deck. I'd go up to 20 lands minimum. If you're concerned about being able to burning tree/reckoner consistently then you can put in another temple garden but really I'd just put in another mountain. You have some 4 mana spells you want to be able to cast and doing that off 19 mana can be tricky imo. I would actually like to see 22 lands, but i just hate being mana screwed. 22 lands 2 being kessig is how I ran it. It was a good mana dump and trampling even for 1-2 was effective.
I think you want the 4th lightning mauler if that's your plan, to be consistent. You could drop a ghor clan rampager for one. He's there to give the surprise I win/tramp advantage. You're most likely never casting him right?
If you're looking to be unblockable with madcap, i think i like gruul charm better it doesn't present the same 2 for one scenario the enchant does and it works for your entire board. If you're using Madcap just to pump I think you'd be better with something like rancor. Rancor is cheap and it leaves you a mana up off a burning tree to cast something else.
Searing spear and pillar are fine I think.
Sideboard. I don't think you'll ever have enough mana to overload mizzium mortars, that's not the plan for it though right? It's a smiter killer?
I don't think I like gruul warchant. Can you tell me how that's played out for you as a 4 drop, on the side?
You might _might_ consider running a couple blasphemous act on the side for a surprise blow out. Test it and see what you think.
I like the rest of the sideboard. You've got stuff for sphinx/thrag, tokens, volcanic str is a must. Not a lot else you can do here.
Last thought, When I went rg aggro I did 22 lands, with thundermaws. It was slightly more midrangy, but more resilient to the blow out. I ran domri too. With your strat your balls deep into being aggro and there's no plan if you get blown out by something. A good midrange deck like jund will probably still crush you the first game and with volcanic str on the side you probably still only stand a 50/50 shot the rest of the match. I pilot jund mid most of the time and decks like this just don't scare me. Only the nut draw really has a chance to beat me game one.
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