IV.) Sideboard
For the sideboard section I will not offer suggested numbers for the cards. Building your sideboard not only regarding the cards you include in it but also their numbers depends too much on the configuration you have settled on for your maindeck and the metagame you are expecting to play against. For some cards the numbers are pretty obvious. Unless your name is Sam Black, you are probably going to play four Leylines if you play Leyline. The sample deck lists in the following section offer some examples on how sideboard configurations can look. There is also an excellent three part video series on sideboarding with the deck on Youtube, I have included links to it among the list of other resources you might want to check out if you want to learn more about the deck below in section V.).
One thing to keep in mind when building a sideboard is: You are playing a deck that uses artifact creatures as your one and only way to win. With a card pool as large as Legacy, there are cards that you will have a hard time against: Null Rod, Hurkyl's Recall, Energy Flux, Rest in Peace/Energy Field etc. Don't go overboard in trying to build a board that has an out to each and every possible scenario. Figuring out the perfect eleven card boarding plan against niche cards like Null Rod and Energy Flux will lose you too much space to efficiently board against the other 99% of the field.
On another note, the deck is not a combo deck as Storm is, but it is a combo deck in the sense that it is built on synergies. It is easy to overboard. Unless you absolutely need all ten cards you want to board in, be cautious of taking out too many creatures for example.
Ensnaring Bridge
As your own creatures are rather small at the start and need time to grow, you need a form of defense against decks that rely on attacking with big creatures to win. You can empty out your own hand pretty easily, especially in a list with Foundry Inspector. And even if you can't empty out you whole hand, it is not difficult to get low enough to cross the threshold where Reality Smasher, Griselbrand, Craterhoof Behemoth (and friends), Emrakul or Marit Lage or even True-Name Nemesis can no longer attack. You can still win by sacrificing Ensnaring Bridge to an Arcbound Ravager once you have enough of a board to alphastrike or use Walking Ballista to shot them a bunch.
Leyline of the Void
Really not much to say here. There are a lot of decks relying on their graveyards running around these days, so you want some form of graveyard hate. Leyline has the obvious disadvantage of forcing you into some difficult mulligan decisions, but it's effect is much more powerful than Faerie Macabre or Tormod's Crypt. Relic of Progenitus and Surgical Extraction are nonstarters in a Chalice of the Void deck for obvious reasons.
Spellskite
Shines against decks that try to overload you with removal or need to remove your disruption pieces to be in the game at all. Also just wrecks Infect. Just don't get greedy with it. When your opponent attacks a one power creature into a Spellskite, take the possibility of Lightning Bolt into account. Sometimes you have to block, but sometimes it is worthwhile to take the damage and protect the Spellskite to make sure that it in turn can protect another artifact.
Ratchet Bomb
Colorless removal options for non-creature permanents are few and far between and this is probably the best one available at the moment. Also doubles as a sweeper against tokens or decks like Elves that rely on multiple permanents with the same casting cost.
Sorcerous Spyglass
A lot of activated abilities are running around in decks at the moment. Planeswalkers, Deathrite Shaman, Rishadan Port, Stoneforge Mystic, Aether Vial, Griselbrand, Sneak Attack, Thespian's Stage, Vampire Hexmage, the list goes on and on. Sorcerous Spyglass is preferred over additional copies of Phyrexian Revoker because some of the cards you want to needle are lands, making the trade off of this not being a creature worth it.
Mindbreak Trap
Hurkyl's Recall is actually quite a common sideboard card in Storm right now. Mindbreak Trap gives you turn zero interaction against fast combo decks and dodges any artifact hate cards that they will have after boarding. At some point adding more and more artifact hate cards will show some diminishing returns and it can be better to diversify your hate a bit.
Warping Wail
A good way to get a lot of utility in one slot. Does a lot of good things, but you pay the price of it not being the best at any of the things it does.
Dismember
Removal for medium big creatures but at a heavy price. You already lose quite a bit of life to Ancient Tomb and (possibly) Vault Skirge. With or without a black splash, your mana artifacts can produce black mana to mitigate the cost somewhat, but so far it hasn't made the cut for me.
Spine of Ish Sah
If your metagame has a lot of Sneak Show in it and you want more/other answers than Ensnaring Bridge. Synergises nicely with Arcbound Ravager to reuse it over and over for additional Show and Tells.
Sword of Fire and Ice/Umezawa's Jitte
Both found in lists that don't have any equipments maindeck and in lists that have. Either to open up the possibilities equipments provide or doubling down for the matchups where you really want the effects. Despite what I have said about the inclusion of an Inventor's Fair/Sword of Fire and Ice package in the maindeck, I have recently started playing an Umezawa's Jitte in the board. I think of it as more of a fifth Walking Ballista than anything else. I even contemplated Serrated Biskelion before a friend of mine was nice enough to tell me not to be stupid.
Toxic Deluge
Stand in for possibilities that open up when you decide to splash a color. It makes sense from a game design perspective to not have the best answers be colorless, but the result is, that sideboarding is probably the place where being straight up colorless hurts the most. It significantly reduces the available tools or forces you to play suboptimal answers. Still so far I have preferred the advantages of colorless lists to the upgrades provided by including a splash color.
Fill-Ups
Another valid sideboard option are cards that you cut from your maindeck. Can't find room for the fourth Hangarback Walker/Thorn of Amethyst/more copies of Lodestone Golem but still want them for specific matchups? Put them here.
V.) Other Resources
- Jeff Hoogland playing the deck - Link
- Andrea Mengucci playing the deck - Link
- Jarvis Yu playing the deck - Link
- Three part series about sideboarding with the deck by Amadeus Grün and Hedron.TV - Part 1, Part 2, Part 3
- more links to reports, videos, articles about the deck to be added later -
VI.) Sample Lists
1.) Greg Kraigher – 21.10.2017 NA Legacy Champs 56/711
4 Arcbound Ravager
4 Steel Overseer
4 Walking Ballista
4 Lodestone Golem
2 Phyrexian Revoker
4 Scrap Trawler
4 Chalice of the Void
4 Sorcerous Spyglass
3 The Abyss
3 Mox Opal
2 Mox Diamond
4 Ancient Tomb
4 City of Traitors
4 Wasteland
4 Inkmoth Nexus
1 Karakas
1 Swamp
4 Vault of Whispers
Sideboard
1 Coercive Portal
1 Crucible of Worlds
1 Diabolic Edict
4 Leyline of the Void
2 Spine of Ish Sah
1 The Abyss
2 Toxic Deluge
1 Umezawa's Jitte
2 Warping Wail
2.) Amadeus Grün – 07.01.2018 MKM Frankfurt 2/380
4 Arcbound Ravager
4 Steel Overseer
4 Walking Ballista
2 Hangarback Walker
2 Lodestone Golem
4 Phyrexian Revoker
4 Vault Skirge
1 Sword of Fire and Ice
4 Chalice of the Void
4 Thorn of Amethyst
4 Lotus Petal
3 Mox Opal
4 Ancient Tomb
4 City of Traitors
4 Wasteland
4 Mishra's Factory
2 Inventors' Fair
2 Karakas
Sideboard
2 Spellskite
4 Leyline of the Void
4 Ensnaring Bridge
1 Sword of Fire and Ice
2 Sorcerous Spyglass
2 Ratchet Bomb
3.) Noah Pardes – 28.01.2018 SCG Classic Philadelphia 16/176
4 Arcbound Ravager
4 Steel Overseer
4 Walking Ballista
2 Hangarback Walker
2 Lodestone Golem
4 Phyrexian Revoker
4 Vault Skirge
4 Chalice of the Void
4 Thorn of Amethyst
1 Sword of Fire and Ice
4 Lotus Petal
3 Mox Opal
4 Ancient Tomb
4 City of Traitors
4 Wasteland
4 Mishra's Factory
2 Inventors' Fair
2 Karakas
Sideboard
4 Ensnaring Bridge
2 Ratchet Bomb
2 Sorcerous Spyglass
2 Spellskite
4 Leyline of the Void
1 Umezawa's Jitte
4.) Antarctica – 19.03.2018 MTGO Legacy Challenge 14/85
4 Arcbound Ravager
4 Steel Overseer
4 Walking Ballista
4 Lodestone Golem
4 Phyrexian Revoker
4 Vault Skirge
4 Chalice of the Void
4 Thorn of Amethyst
1 Sword of Fire and Ice
4 Lotus Petal
3 Mox Opal
4 Ancient Tomb
4 City of Traitors
4 Wasteland
4 Mishra's Factory
2 Inventors' Fair
2 Karakas
Sideboard
3 Ensnaring Bridge
4 Leyline of the Void
2 Ratchet Bomb
2 Sorcerous Spyglass
2 Spellskite
1 Umezawa's Jitte
1 Warping Wail
5.) Joe Ricci – 06.04.2018 GP Seattle Trial 1/n.a.
4 Arcbound Ravager
4 Steel Overseer
4 Walking Ballista
4 Hangarback Walker
4 Lodestone Golem
3 Phyrexian Revoker
4 Vault Skirge
4 Chalice of the Void
4 Thorn of Amethyst
1 Umezawa's Jitte
2 Lotus Petal
2 Mox Opal
4 Ancient Tomb
4 City of Traitors
4 Wasteland
2 Mishra's Factory
2 Cavern of Souls
2 Inventors' Fair
1 Karakas
1 Phyrexian Tower
Sideboard
4 Ensnaring Bridge
1 Faerie Macabre
4 Leyline of the Void
1 Ratchet Bomb
2 Sorcerous Spyglass
1 Spellskite
1 Sword of Fire and Ice
1 Warping Wail
VII.) Personal Current List
4 Arcbound Ravager
4 Steel Overseer
4 Walking Ballista
4 Hangarback Walker
3 Phyrexian Revoker
4 Foundry Inspector
4 Chalice of the Void
3 Thorn of Amethyst
3 Karn, Scion of Urza
2 Lotus Petal
2 Mox Opal
2 Mox Diamond
4 Ancient Tomb
4 City of Traitors
4 Wasteland
3 Blinkmoth Nexus
2 Mishra's Factory
2 Karakas
2 Cavern of Souls
Sideboard
2 Sorcerous Spyglass
1 Thorn of Amethyst
2 Ratchet Bomb
4 Leyline of the Void
1 Umezawa's Jitte
3 Ensnaring Bridge
2 Spellskite