MTG Salvation

My list has zero cards. If we were to restrict it to my competitive decks, there would be one card
1 Strip Mine

Vendilion Clique does not make enough use of colorless mana to justify a Sol Ring. Reliquary Tower is usually win-more. Sensei's Divining Top appears in a lot of decks, but is not that great in other places. Wasteland should be everywhere, but it's expensive and I usually prioritize my own fixing, especially in five color decks, over land destruction. Solemn Simulacrum doesn't fit into Vendilion Clique due to not being instant speed. And is of questionable importance in decks with good land ramp. Crucible of Worlds almost always makes the cut. Skullclamp is also pretty good. Steel Hellkite tends to pick up a spot in colors that need the x effect.

In other colors

I don't really wanna put anything else because colored cards can't go into EVERY deck and that is what the OP asked for. The only reason Kozilek is there is for the ability to reshuffle the library and he is typically the best one when cast.

Umm for everydeck:
100%

Sol Ring
Sensei's Divining Top
Strip Mine
Wasteland
Reliquary Tower
Lightning Greaves
Boseiju, Who Shelters All
Vesuva
Solemn Simulacrum

90%

Swords of Fire and Ice
Akroma's Memorial
Coalition Relic" target="blank">Coalition Relic
Crucible of Worlds

Green:

100%

• Primeval Titan
  
• Avenger of Zendikar
  
• Eternal Witness
  
• Tooth and Nail
  
• Cultivate
  
• Kodama's Reach
  
• Sylvan Library

Quote from GouGou

Umm for everydeck:
100%

Sol Ring
Sensei's Divining Top
Strip Mine
Wasteland
Reliquary Tower
Lightning Greaves
Boseiju, Who Shelters All
Vesuva
Solemn Simulacrum

90%

Swords of Fire and Ice
Akroma's Memorial
Coalition Relic" target="blank">Coalition Relic
Crucible of Worlds

Green:

100%

• Primeval Titan
  
• Avenger of Zendikar
  
• Eternal Witness
  
• Tooth and Nail
  
• Cultivate
  
• Kodama's Reach
  
• Sylvan Library

Might want to add Abundance to that green list. Its totally broken with scroll rack and library.

And wth is scroll rack on no one's list?

1. Sol Ring
2. Expedition Map <-- love this card soooooo much!
3. Strip Mine
4. Sensei's Divining Top

The only card that I play in all of my decks is Reliquary Tower.

I don't think there's a single card I play in every deck, though Sol Ring is in most.

If I wanted to be cute I would say "Island," but that's not strictly true either. Almost as common as Sol Ring for me, though.

im surprised by how often reliquary tower is showing up. I only run it in decks that actually have ways to draw a bunch of cards. there are just so many other good colorless utility lands. and with 3color decks its hard to justify running too many.

personally one copy of an LD land(in my case tec edge) is more auto-include than reliquary tower.

Wow, I can't believe some of these lists. Any list over like ten cards especially. Don't you ever cut cards just because you get bored of seeing them in every deck? Like, I understand most decks benefit from SDT and Sol Ring, but don't you ever just want to use more different cards? Also, I'm shocked to see so many Sword of Fire & Ice replies. Haven't y'all tried creatureless decks, or decks with creatures that don't attack?

Personally, once I notice too many copies of a card between my decks, I go out of my way to avoid using it anymore. I'll even build decks purposed entirely to prove a deck can function fine without that card, or that type of card. For example, I recently build a Rhada deck that has no nonbasic lands (that aren't Strip Mine) or artifacts. It is awesome and fun.

Anyway, this is a list of cards that have gone into EVERY Commander deck I've ever built:

Strip Mine

I would probably add Tectonic Edge and Ghost Quarter to that list, but I don't use them in my group hug deck.

Quote from Orpheos

im surprised by how often reliquary tower is showing up. I only run it in decks that actually have ways to draw a bunch of cards. there are just so many other good colorless utility lands. and with 3color decks its hard to justify running too many.

personally one copy of an LD land(in my case tec edge) is more auto-include than reliquary tower.

I also can't agree with this enough. In many decks, Reliquary Tower does literally nothing. In some decks where it lets you keep cards in hand instead of making you discard at end of turn, all it's doing is creating the illusion of an upside, because given your limited mana, you were never going to cast a lot of the cards in your hand anyway. Often I will take a basic land over a Tower.

Spinny top, of course.

I am also surprised by people who are saying Reliquary Tower. Granted, I usually play decks with 3 colours so I usually can't afford the colourless. Even so, I really very rarely get that many cards in hand unless I'm playing blue, and even then it's extremely rare to ever have to discard EOT.

Why not Reliquary Tower if I am using Sylvan Library,Necroprotence,Harmonize,Phyrexian Arena,Skullclamp,Life from the Loam etc

• Sol Ring
  
• Sensei's Divining Top
  
• Lightning Greaves
  
• Expedition Map
  
• Strip Mine
  
• Reliquary Tower (maybe cause I always play blue)
  
• High Market
  
• Duplicant

...

Bribery

Sol Rings as long as I have 'em. Greaves and Whispersilk Cloak are in most decks too, as when I plan to use my commander, I like it actually staying. These will become Swiftfoot Boots and Champion's Helm once CMD and M12 hit

And because I'm nearly incapable of playing a deck without black:
Demonic Tutor all day

Since almost everything I play is 3 color:

• Sol Ring
  
• Exotic Orchard
  
• Sensei's Divining Top
  
• Mana Vault
  

and now...

• Homeward Path
  
• Command Tower
  

I don't run tower because for my strategies I actually like to be able to discard things from my hand.

I change mine up alot, so really only sol ring is sacred.
But I think all mine have had, at one point or another:
Erratic portal - prevents removal and re-uses ETB triggers
Lightning greaves
Tech. edge
Planar protal - gotta get another one of these
Omen Machine or Knowlage pool....I will randomly throw one into any deck that can tutor for it (almost all mine have blue or black) and take it back out afterwards. just to drop it on my unsuspecting friends.

Reliquary Tower, Strip Mine, and Expedition Map. Sol Ring would be in all my decks, but I don't own enough.

Strip Mine, Reliquary Tower(there are a LOT of Howling Mines and Font of Mythoses in my group), Pithing Needle, and Lightning Greaves

Reliquary Tower and Sol Ring.


Lightning Greaves and other general protection is not needed since the general is only a Plan D win condition in most of my decks.

The only cards that I put in every EDH deck I make are:

Sol Ring
Reliquary Tower
Sensei's Divining Top
and soon to be Homeward Path

Everything else is conditional, imo.

Quote from RWF_Less

I somehow forgot about Top... that's a pretty big omission on my part. As for Homeward Path, I'm not so big on that. I play Thada Adel, and I'd have to give everyone pack their permanents.

You know its only for creatures, don't you?

- All my decks have black so I have a big auto include lists.
Sol Ring, Mana Vault, Sensei's Divining Top, Strip Mine, Crucible of Worlds, Demonic Tutor, Dark Confidant, Hypnotic Specter, Dark Tutelage, Diabolic Edict, Liliana Vess, Maze of Ith, Phyrexian Tower, Volrath's Stronghold, Mind Twist, Phyrexian Arena, Lightning Greaves, Ulamog, the Infinite Gyre,and Reanimate.

- If I'm playing blue, it depends on the build, same goes for any other colour combination.

For me this everything utility:
Strip Mine
Dust Bowl (Prefer it to one use lands)
Mind's Eye
Sol Ring
Sensei's Diving Top
Reliquary Tower

I tend to run one sac outlet land in each deck too, I still will, even with Homeward Path available.