Tech Cards for Every Color in cEDH

Culling Ritual by Lorenzo Mastroianni
With the new cards added to the ban list, a lot of people are uncertain about the direction that their decks are going to take. Decks that relied on Dockside combos are severely hurt or outright dead in some cases, and without Mana Crypt
Dorks are going to become a lot more prevalent now that the most broken starts in the format are going to be turn-1 Sol Ring
In 2024, I believe that all five colours are roughly equal in overall strength, though they each have their own distinct advantages. Most colours have plenty of good removal options, so outside of a few low-colour decks, removal is generally always "good enough. Each colour also has some unique options that usually get overlooked that can impactfully attack your meta.
White - Interacting doesn't have to be bad for you
White has been quietly gaining cards since the days when both it and red were barely used. Even though blue is considered the colour of card advantage, when you're playing against three other people, trading one-for-one means you're going down in cards compared to the rest of the table, but white usually interacts with the table as a whole. White is the best colour at interacting with your opponents if you're concerned about card disadvantage from counterspells.
White gained a lot of decent card advantage engines, like Esper Sentinel
Silence and its variants are the best way to force a win through interaction, and the creature variants are hard for most decks to counter. Slamming a Grand Abolisher
Ranger-Captain of Eos
Cards such as Drannith Magistrate
Lavinia is another niche stax piece that can be an extremely powerful response to fast pods if you're concerned about being able to untap on your second or third turn. She does have a significant drawback in that she turns off other players' free interaction, though, so be careful. While the downside can cost you the game, she is also the best white card that isn't a Rule of Law
Blue - Drawing cards never goes out of style
Blue has been a broken colour since the game was released, and this remains true in cEDH. It has the strongest individual grind engines, and you can make sure you get the time to enjoy using them. UB decks also have an incredibly powerful one-card win condition in the form of Mnemonic Betrayal
I was surprised by how shallow the pool of blue cards feels when you exclude counterspells. When I built my most recent attempt at Tymna Kraum Naus, I only had about 17 blue cards, and half of them were countermagic. It's not exactly what you would expect when it's normally considered "the best colour of all time," though its list of banned cards helps on that front.
While Rhystic Study
Blue has gotten a new niche lately in cards that allow you to play everything at flash speed to allow you to wait to make your plays without tapping out. Borne Upon a Wind
Finally, blue has some strong options for cheap alternatives to Cyclonic Rift
Black - Who said blue has a monopoly on busted cards?
Black has a pool full of staples, but it also has a fairly broad range of effects. Tutors, rituals, and cards that act as one card wincons are the most prominent cards black has, and the consistency of having access to black tutors should not be understated.
Black is simply the best colour at winning the game. Most decks are able to find a way to win with a single Demonic Tutor
More than just tutors, though, you also have the most powerful rituals in addition to one-card wincons such as Ad Nauseam
There's more depth in black's card pool than just trying to slam wins, though. It has cards like Lotho, Corrupt Shirriff
Toxic Deluge
A niche in some very slow decks like Talion or Yuriko can be multiplayer edicts such as Sheoldred's Edict
Red - Something from nothing
Red has by far the most shallow pool of staple cards, but it also has some of the most powerful cards in the format that win the game from a board state of absolutely nothing. Dockside was just banned, but Breach is still one of of the most broken cards in the format, and red has a lot of other useful cards for aggressive strategies thanks to its rituals and the Final Fortune
Final Fortune effects have obvious synergy with Necropotence
However, red actually has a very large pool of cards that fight against midrange decks as well in the form of Pyroclasm
It's a very meta-specific use case, but there are a lot of decks that will rely on their low toughness creatures, and Pyroclasm is cheap enough to be used on turn 1 as a tempo play or be sequenced into a turn without having too much trouble. Tymna Jeska is my favourite deck to play, and I love having permanent access to a mini board wipe in the command zone.
The big winner for red in cEDH with the new bans is land hate. Blood Moon
Red also has a fair number of combat-centric cards. Professional Face-Breaker and Loyal Apprentice are two cards that dominate grindy games with Tymna, and Inti, Seneschal of the Sun is a card that has seen some success as a grind engine as well. Red isn't a colour that has a huge number of generic staples, but it has a lot more options than what is commonly talked about.
Green - The tech support team of cedh
Finally, green is quite possibly the most underrated colour in cedh at the moment, though that might change with the recent bannings. Because it doesn't have a lot of splashy cards like the other colours do, a lot of people will call it the worst colour, but mana dorks do a lot to help stabilise mulligans and reduce the number of non games that you end up with, and rumours of its death by Orcish Bowmasters were greatly exaggerated.
In addition to the stable ramp of mana dorks, though, it also has a fair number of rituals to add for aggressive strategies: Elvish Spirit Guide, Tinder Wall, and using Crop Rotation for Ancient Tomb are all nice to have, to say nothing of the Golgari response to Dockside Extortionist that is Culling Ritual.
Though they become a less relevant than they were when Dockside was in the format, green creature tutors are still powerful if you have good targets; they're on par or better than casting Demonic Tutor for the creature, and usually have addition utility. Finale of Devastation doubles as a win condition for some decks, Chord of Calling has convoke and is instant speed, and Neoform and Eldritch Evolution both cheat on mana costs.
Collector Ouphe used to be one of the best cards in the format at stopping your opponents from winning quickly, but with the death of Dockside, its relevance has gone down a lot. Rog Silas is still a powerful deck, and the best decks in the format are still extremely powerful, but it's no longer a necessity for slower decks. It's still quite powerful at what it does, and can be relevant against a pod full of fast decks, but the problems it fixes aren't as common.
Pick Your Poison is also very strong tech that hampers all of your opponents' development or punishes the cards that they power out. Stripping away everyone's mana artifacts or Rhystic Study is a very powerful punish for a single mana.
The colour is also very good at going over the top with cards like Gaea's Cradle and some of the two-mana dorks, like Fanatic of Rhonas, Bloom Tender, and Priest of Titania. Sylvan Safekeeper is an incredibly powerful card to protect a creature-based combo, and playing to the board is a lot safer now than it has been before, so I'm excited to see how these cards shape up in the future.
Green isn't the most explosive colour in the pie, but it makes up for this with tools for players who want to adjust their deck to play at any speed. It fights well against aggressive strategies with cards like Collector Ouphe and Endurance, or it can support these strategies with rituals and using tutors to help find cards like Grand Abolisher.
Innovating Tech Cards
While your commander affects the colours and direction of your deck, there's always some hidden gems that you can find in Magic's long history. Even ignoring Commander-specific cards, like Seedborn Muse, there are plenty of ways to attack an established metagame and give you an advantage over your opponents. Innovation and trying new things has never hurt anyone, and finding niche cards that do what you need them to always feels rewarding.