Tiamat's journey to the finals of a competitive cEDH tournament may be unexpected, but rest assured it's a very real one — full of explosive victories, unexpected interactions, and decisions that many would consider controversial.
In this article, we'll follow round by round how this deck by Nielk96 performed - analyzing the most impactful plays, the cards that stood out - and also the disappointing ones -, as well as suggesting some changes to the list going forward!
Tiamat - Decklist
Let's start with the decklist. Tiamat gives access to all 5 colors, which allows for consistency with Ad Nauseam and guarantees a Food Chain combo with your commander!
In Nielk's words, the post-Naus possibilities of this deck are even superior to those found in RogSi! Which makes sense, since this strategy has two more colors.
Oh, and if you want to talk about this deck or know more about it, you can talk to Nielk through Discord! Here's the link!
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This article is not to teach you how to play with the deck - it is mainly a turbo Naus deck with a little spice. The decklist above is your starting point, and if you want to understand how the Food Chain combo works, we have a deck tech for Etali, Primal Conqueror in this article, which explains it in detail!
Other than that, all other victories are very simple: play Thassa’s Oracle, win the game!
The Tournament
Let's see how the deck fared in the tournament, round by round!
Round 1 - Rituals, Breach, and Turbowin

In Round 1, the deck promptly showed its explosive win potential. A Dark Ritual followed by Ad Nauseam on turn 2 almost got there, but unfortunately it was stopped with a counterspell from the Thrasios, Triton Hero player.
However, none of that mattered: next turn, Gamble with four other cards in hand, Underworld Breach wasn't discarded, and so it was a repeat from the previous turn with Dark Ritual and Breach to end the game on turn 3. Two turns, one win.
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Round 2 - Rhystic Study is a really good card

Round 2 had an unusual play that changed everything: a turn 3 Rhystic Study was stolen with a Commandeer from the Kinnan, Bonder Prodigy player.
Later, Kenrith, the Returned King exiled their own library at the end of the previous turn with Tainted Pact, and revealed Thassa’s Oracle among the final cards, setting up the win.
Next turn, after a heated debate about whether or not to give cards to Kinnan, who at that moment had two Rhystic in play, it was decided to give in and let them draw. Kinnan drew enough to find an Endurance and prevent the Thassa's Oracle win, and in the end it was a tie.
Round 3 - Yusri's charm

It's not all wins and ties in Tiamat's life. Yusri, Fortune's Flame was the star this round: attack on turn 3, success on all coin flips, and with the Omniscience's effect on, ended the game in style.
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Our deck didn't have time to react, but it was worth it to see such stunning performance.
Round 4 - Perfect starting hand

This was, as said by Nielk, as clean as it gets.
With a powerful start and lots of mana available by turn 2, Silence into Demonic Tutor into Ad Nauseam, and then Underworld Breach. No one had any interaction. Simple and clean, like the deck was made to do.
Round 5 - Strategic ID
Since all players were already guaranteed in Top16, they all agreed on a draw - saving energy for the semifinals. It's a strategic decision that makes all difference when the event goes long.
Semifinals - That was a fast combo
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This should be a perfect Instagram reel: Watery Grave + Chrome Mox on turn 1, Imperial Seal to fetch Thassa’s Oracle. Turn 2, land, and the infamous Thassa’s Oracle + Demonic Consultation duo . Game was over before anyone could say "in response".
Finals - Ragavan, exhaustion and coin flips

In the finals, after a mulligan to four, it was a somewhat demoralizing start.
Nielk tried to recover from this with an Imperial Seal for Necropotence, but Necro was exiled by a Ragavan, Nimble Pilferer with dash.
A few turns later, Kinnan, Bonder Prodigy cast an Emrakul, the Promised End and controled Kenrith, the Returned King's next turn, forcing Kenrith's defeat with their own Demonic Consultation.
After this, everyone realized that there was no way to stop an imminent victory attempt from Yusri, Fortune’s Flame.
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Because of this, Kinnan, Bonder Prodigy tried to win with Tidespout Tyrant and infinite mana before the Izzet player could untap, but Yusri responded with Pyroblast, and our Tiamat player presented Swan Song, trying to force a draw.
Yusri refused — which was a tell that they had another counterspell in hand.
At this point, Nielk admitted to being exhausted. Even with Demonic Consultation available to search for Pact of Negation, he preferred not to risk it. However, one can't be too judgemental: this line of play wouldn't put him closer to a win, and the Pact would still need to be payed next turn.
He also tried one last shot with Cabal Ritual and Orcish Lumberjack, sacrificing Bayou, and then tutor for Ad Nauseam, but it was countered. Yusri ended up winning afterwards by chaining extra turns and getting good coin flips.
Analysis - What Worked and What Didn't
Exceeding Expectations

Orcish Lumberjack synergized perfectly with Ad Naus' fast lines, generating explosive ramp for a decisive turn, even if it's a little bit risky.
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Ad Nauseam, as expected, was the deck's shining star, worthy of building the entire deck around it.
Underworld Breach was essential for plan B victories, and should never be removed from the list.
Below Average

Ragavan, Nimble Pilferer, even with the dash, did not bring much to the strategy, especially when compared to others like Dragon's Rage Channeler, which constantly fills the graveyard.
Suggested Changes and Techs

During our talk, Nielk also revealed important adjustments when going against experienced players. According to Nielk, the deck works much better against opponents who are not familiar with Tiamat's play style.
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When against more experienced tables, who may be familiar with the overall strategy, he recommends replacing Tiamat with Niv-Mizzet Reborn or The First Sliver, and Terror of the Peaks with Corpse Knight.
Niv-Mizzet isn't affected by Opposition Agent, which in turn locks out Tiamat, while Corpse Knight does not target, costs 2 mana, and causes life loss, which makes it possible to win against The One Ring.
Fun fact: Tiamat is unaffected by Void Winnower. Niv, on the other hand, needs some support, like Ruthless Lawbringer. In the end, Opposition Agent is a much more common threat.
The deck can also be modified to focus more on Food Chain or Underworld Breach, depending on your meta. Still, its core is the same as a RogSi deck - only with less free interactions - due to the lack of a commander that actually comes into play -, and more Silence effects, in addition to a superior Ad Naus chain, according to Nielk.
Conclusion
Tiamats performance in this tournament proves that there is room in cEDH for alternative strategies, and that player skill certainly makes a difference.
With explosive mana, quick combos, versatile techs and a curve designed for Ad Nauseam, the archetype showed consistency even against very strong opposition. The key was to understand the meta, adapt the list and make bold decisions (sometimes too bold, as the player himself admitted).
Have you ever faced or piloted unusual lists in cEDH? Do you agree with replacing Ragavan for Channeler?
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Tell us in the comments what you thought of this journey and what adjustments you would make!
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