Hour of Promise can either grab the full Dark Depths combo, or it can grab Valakut + T-Stage, which gives you a lot of options. It can also pull out any other combination of helpful lands, like Glacial Chasm.

Constant Mists is a way to take advantage of your mass of lands, and can let you stay in the game far longer than you have any right to with this card.

Sylvan Library + Abundance is a pretty sweet little combo that lets you draw 3 cards per turn. Since Abundance "draw" triggers don't actually draw, but rather place the cards in your hand, as long as you trigger Abundance on all three Library triggers, you get to draw 3 cards. Both cards are obviously pretty good on their own too.

Prismatic Omen drastically increases the power of your Valakut combo. Gratuitous Violence also helps with the combo, and drastically boosts the power of your tokens and beaters.

Vorinclex, Voice of Hunger is just a stupidly awesome power-house. Not only does he double your mana, but he shuts down your opponents plays for as long as he's in play.

Eternal Witness and Skullwinder are really great recursion effects.

Realm Seekers often comes down with 15+ +1/+1 counters and can single-handedly set up any land combo you want.

Magus of the Moon and Blood Moon are great for stalling out opponents. They have the side effect of turning off Valakut though. I run them in my R/G Borborygmos deck and they pay off more often than they mess you up.

Yavimaya Hollow is a great land to have in your toolbox. Lotus Vale too

Petrified Field + Realms Uncharted forces the opponent to make bad choices, and almost always nets you your Valakut combo, or something just as beneficial.

Wheel of Fortune is pretty great in here if you can get your hands on one. Tooth and Nail and Insurrection win games all on their own.

Sylvan Safekeeper can help you keep your permanents safe while throwing lands in the yard for later use.

Decimate and Gleeful Sabotage are amazing pieces of removal in these colors.

The main reason to run Boundless Realms is as a win-con once Valakut is in play. It can often give you enough bolts to take out all of your opponents.

Wow, lots of tips Saljen. First of all: Thanks a lot for taking the time to leave some feedback! I think I’ve considered most of your mentions though and ended up not including them due to certain preferences. Lots of cards to respond to, so here goes:

• I used to run Hour of Promise and I like the card. However, I ended up cutting it when other land tutors were printed. I think it was Pir's Whim that has taken its place.
• Constant Mists I also used to run, but I found that I did not run enough cards that synergize with it. I would probably put it back if I ever change the list to be more graveyard-oriented (similar story for Sylvan Safekeeper), or if my meta starts playing more aggro. It is a card I really like though, so I would like to run it again.
• I’m aware of the Abundance Sylvan Library combo, but that situation will occur very rarely (especially as I run no ways to tutor for enchantments). So most of the time Abundance will see play on its own. And as a stand-alone card, I do not think it warrants a spot in the deck. Same story with Prismatic Omen, which only other synergy is it makes Dark Depths and Glacial Chasm tap for mana. These cards are great when they combo, but mediocre when they don’t imo. Gratuitous Violence only works when creatures deal damage, so I don’t see how that helps with valakut…
• Eternal Witness and Skullwinder are indeed great recursion cards! However, I run witness in so many decks already so I wanted to focus on lands in this list for my recursion cards for some variety. I prefer those recursion cards over witness and skullwinder.
• I never really read Realm Seekers well enough it seems :). Will reconsider that card!
• I’ve built this deck to make the lands shine! Magus of the Moon and Blood Moon turn the stars of my deck into mountains… I agree they are great cards for stalling opponents, but it goes against what I want to do with this deck. Also, I tend to steer away from cards that mess with my opponents' lands (already cut Jokulhaups for that reason). That’s also why I’m also not running Vorinclex.
• Yavimaya Hollow is useful, but not necessary in this list I think. I never really considered it for this deck however. So I will do that :)!
• I did not include Realms Uncharted in this list as I’m not focusing on graveyard synergy. But I never considered it in combination with Petrified Field, so maybe that will change things ^.^. However, I do really like the land tutors that are already in the deck.
• Wheel of Fortune is awesome. However, I only have one of them, and I put that one in a Daretti deck, where it is more valuable for the deck strategy. Here I can run other carddraw and not feel bad about it ;). I don’t think it makes a big enough difference here to warrant that price tag.
• T&N I am already considering in this deck, but haven’t decided on it yet :). Insurrection is nice, but does not have any synergy here with the strategy or themes (I do run it in another deck where I think it is more at home).
• I agree Decimate and Gleeful Sabotage are decent removal options, but I prefer the removal pieces I ended up selecting for this list.
• You did see I only run 5 mountains right? I don’t see how Boundless Realms is going to kill all opponents with Valakut unless I have valakut copied a bunch of times and if I have a bunch of other cards in play as well that I don’t run. I actually wrote quite extensively about why I do not run Boundless Realms in my description and I stand by those arguments.

Thanks a lot for dropping by. I will consider realms uncharted, petrified field, yavimaya hollow and realm seekers ;).

Cheers,

Beebles

Awesome build, and an equally awesome primer! +1 from me!

Thanks AngelicOverseer88!! Glad you like it :)