I already have a copy of Grim Monolith so the money aspect isn't an issue. With regards to playing things faster, it would definitely work, and definitely be impactful, but i'm happy with how things are. I'll playtest it with MindStone as I prefer the immediate mana and being able to tap rather than slower mana like Steve.

I've considered Ancient Tomb but I never liked being pinged every time I tapped it. I'll look at it again for the deck though.

Castle Garenbrig is already in the deck. It's a fantastic card and I love using it.

Skullclamp is a great card, and I ran it at one point, but spending the extra mana each time to use it slows things down and I generally don't want to spend the mana on it. My dragons don't die that often, and when they do it's often to exile. I like Greater Good effects better where I can sacrifice them at will and I only have to pay the cost once to put it on the battlefield.

Thank you for the suggestions! The deck has definitely been improving consistently. I generally don't have a budget for my decks as I've been playing for over 20 years and have owned many of the pricy cards for years (before they were pricy).

Fair, but if i'm doing that i'd almost be better off playing Grim Monolith as it'll accelerate me even faster, and I can untap it on the off turns when I don't need the mana. However, I like the fact that it taps for colored as my spells in this deck often tap for multiple colored pips. I'm actually leaning more towards Vexing Puzzlebox as it'll give me my colored mana as well as a fetch.

And in terms of being less threatening late game, this deck is honestly threatening the whole game. It just starts really quickly so it's hard to stop. There are very few times where dropping a Drakuseth, Maw of Flames, Scourge of the Throne, etc. with haste and doubled power/toughness isn't scary. That's why this deck works so well. It doesn't matter the turn. It just keeps going. If they remove one card I play another. If I need I can draw more cards and keep fighting. It's a really well tuned and consistent deck, and now that i'm playing in several different playgroups, some with board wipes, some with single target removal, and all with different playstyles and decks, I can confirm it works everywhere, regardless of the meta.

Profet93 I made a few more tweaks as I am trying to power down a number of my decks while increasing their speed and efficiency. As such I removed Defense of the Heart, Bard Class, and Mana Reflection and replaced them with Ruby Medallion, Emerald Medallion, and Carpet of Flowers.

Defense of the Heart was both too powerful and drew too much hate before I was ready. I want this deck to explode outwards and delaying that hate and attention even 1 turn helps.

Bard Class is still a great card and i'm leaving it on my maybeboard in case I want to add it back, but I prefer the speed that Ruby Medallion and Emerald Medallion bring as they only require a 2 mana investment as opposed to the 4 mana required to turn on Bard Class.

Mana Reflection is along the same lines. If I can spend 2 mana for Ruby Medallion or Emerald Medallion to cut my costs by 1 as opposed to waiting until turn 6-8 to play Mana Reflection and double my mana, i'm several turns ahead of where I would be, not to mention that Mana Reflection is more likely to be destroyed as opposed to a small medallion that only reduces costs by 1 rather than doubling all my mana.

Not to mention that around 80%-90% of 4-player commander games feature someone with blue mana, which will allow me to generate a ton of mana with Carpet of Flowers. That, along with 2 medallions, should really help this deck take off.

That's where i'm at right now, and I feel like this should work really nicely. I'd love to hear your and anyone else's thoughts, but i'm really happy with how this deck has turned out.