-- Mana Base --
The reason for the Wooded Foothills is because it is a fetchland that I have in real life. You can replace it with anything that searches mountains or islands
I play Flooded Strand instead of Scalding Tarn in real life because it is much cheaper (currently at least).
Seven basic Islands because of Blood Moon sideboard.
Sulfur Falls will be a Volcanic Island 99.1% of the time.
Steam Vents because searchable and best Modern dual land.
--Instants--
Deprive is really good especially late game.
Remand is the best counter in Modern!
I think Rune Snag is better than Mana Leak despite the terrible synergy with Snapcaster Mage and Grim Lavamancer. I honestly don't think it's an issue 99.1% of the time.
Spell Pierce can be annoying. It sees Legacy play so it must be good.
Vapor Snag is the best bounce spell for this deck.
Lightning Bolt and Electrolyze for the burn. Electrolyze is a great utility card. You could cut it in favor of more mana efficient cards, so I might do that soon.
--Sorceries--
Serum Visions is the best draw spell in Modern to my knowledge
Gitaxian Probe is a close second, but I only run 3 because it loses value if you're using it twice in a row (seeing cards you've already seen).
--Creatures--
Delver of Secrets because why not?
Grim Lavamancer has bad synergy with Snapcaster Mage and Rune Snag but it doesn't affect 99.1% of games. Good for recycles fetchlands and cards you probably won't need to Snap back like Gitaxian Probe.
Snapcaster Mage is the best card ever in my opinion. I remember trading for my first was the best feeling ever. Snaps back burn and counterspells which is all you could ask out of him.
Young Pyromancer the second win con here. Good for pumping out tokens to chump block or swing for extra damage.
--Artifact--
The reason I play Sword of War and Peace is because it is cheap, its colors of protection are highly relevant, and it's ability is highly relevant as well. Although Sword of Fire and Ice is probably better, it's also 30 dollars more expensive. Fire and Ice doesn't protect your flipped Delver from Path to Exile either. It's ability is better, generating card advantage and being a Shock, but it's not necessarily lightyears ahead of War and Peace.
--Sideboard--
I don't know much about Sideboard, so I'd say the current sideboard is garbage. It's mostly matchup based on things that I think are hard to beat.
Blood Moon so that you can completely lock out all tri-colored decks (Junk Midrange, Bant Hexproof). Sometimes it's a solid matchup against tron as well.
Flame Slash is the best Tarmogoyf killer in our colors.
Leyline of Punishment is 100% geared towards Soul Sisters.
Shattering Spree and Smash to Smithereens for any affinity or Batterskull or
Wormcoil Engine
Spell Pierce for anytime we end up in a control vs. control match really.
Spellskite is best used against Hexproof or Infect or Burn.
