This One Turn Kill Best Decks & Builds Guide is a collection of deck ideas for One Turn Kill, written entirely from personal experience and personal bias. Some decks here are strong, some are janky, some are just fun, and some only work if the game decides not to bully you that run.
If you read something and think “that doesn’t sound optimal” or “this other card is better”, you’re probably right.
Treat these decks as examples, not absolute answers.
- Current version at the time of writing: v1.0.4
- Deck names include the version they were created in, but that does not mean they only work in that version
- Not every deck here can clear BIAS20
- All explanations are based on average card handling, not perfect infinite-loop play
- This guide is written casually and loosely on purpose
New decks will be added whenever something interesting comes to mind.
Easy Disposal Axis (ver1.0.2)
Essential Cards
- Ferocious Claws
- Kunai Throw
- Genetic Mutation
This is one of the easiest decks to understand and assemble.
The core idea is simple:
use Ferocious Claws to discard Kunai Throw, which turns discards directly into damage. That’s it.
From there, you can start snowballing by discarding cards like Reckless Plan with Genetic Mutation, which quickly gets out of control if your hand rotation feels smooth.
If the deck ever feels awkward or clunky to rotate, swapping Genetic Mutation for something like Regression or Transload makes it much more forgiving.
Both Ferocious Claws and Kunai Throw are in the starting deck, and Genetic Mutation shows up early, so this is a very beginner-friendly setup.
Assassin Burst (ver1.0.2)
Required Cards
- Assassin’s Sign
- Kannazuki Tea Party
Required Upgrades
- Assassin’s Sign
- Kannazuki Tea Party
This is the classic “spin the deck, then delete the enemy” deck.
You rotate your deck as much as possible, reduce costs with Kannazuki Tea Party, then unload everything into Assassin’s Sign in one massive burst.
The play pattern is extremely straightforward, the damage ramps fast, and it doesn’t require complicated setups.
If you’re just starting to understand One Turn Kill’s pacing, this deck is a great stepping stone.
It comfortably reaches around BIAS13, and if you add Nelkar’s Experiment, overkill achievements become trivial.
PPP Discard (ver1.0.2)
Required Cards
- PPP
- Regression
Required Upgrades
- PPP
This deck abuses the constant back-and-forth between hand and deck.
You repeatedly return cards to the deck using Regression and similar effects, triggering PPP over and over while maintaining control of your hand.
Because your cards never stay in one place for long, this deck is surprisingly resistant to most boss interference.
It’s especially useful if you struggle against Bulk, since the constant recycling keeps your options open.
If the deck feels stiff, Transcode is often better than Intuition here.
Once you unlock Axim Core, this deck becomes much stronger and absolutely worth revisiting.
Laevateinn Hyper Carry (ver1.0.2)
Required Cards
- Laevateinn
- Nelkar’s Experiment
- Homeward Journey
Required Upgrades
- Laevateinn
This is pure romance damage.
You stack multiple 3-cost cards, then use Homeward Journey → Nelkar’s Experiment to supercharge Laevateinn and erase enemies in one sequence.
Damage-wise, this deck is easily among the highest in the entire guide.
If you can consistently hit center shots, BIAS20 is very realistic.
That said, this deck is not forgiving.
If your timing or aim is off, things fall apart fast. The author personally failed to master it.
One important rule:
Always use Homeward Journey un-upgraded.
Selecting an un-upgraded 3-cost card gives you two ammo stacks at once, which is crucial.
Recommended only if you trust your execution.
Easy BAS Carry (ver1.0.2)
Required Cards
- BAC
- Intuition
- Nelkar’s Experiment
Required Upgrades
- BAC
- Nelkar’s Experiment
This is the “turn brain off” deck.
You buff BAC with Nelkar’s Experiment or Intuition, then press it repeatedly until everything dies.
BAC being 0-cost makes it hard to accidentally brick your turn.
The author used this deck from upgrade unlocks all the way to just before the final boss.
If you want consistency and minimal thinking, this is one of the safest options in the game.
Backdoor Copy – Double-Edged Sword (ver1.0.2)
Required Cards
- Double-Edged Sword
- Nelkar’s Experiment
- Homeward Journey
- Backdoor
Required Upgrades
- Double-Edged Sword
You buff Double-Edged Sword using Homeward Journey and Nelkar’s Experiment, then multiply it using the Double skill and Backdoor interactions.
It’s stupidly effective.
You absolutely want Double as your first skill, so rerolling until you get it is strongly recommended.
Because this deck burns through cards quickly, combining Iron with Genetic Mutation to increase deck size makes it much more stable.
This is a great introduction to Backdoor-based decks.
Backdoor Copy Assassin (ver1.0.3)
Required Cards
- Assassin’s Sign
- Kannazuki Tea Party
- Backdoor
Required Upgrades
- Assassin’s Sign
- Kannazuki Tea Party
This deck exists because Backdoor is completely unhinged.
You duplicate the Double skill using Backdoor, flood your hand with Assassin’s Signs, then unload everything at once.
The opening turn matters a lot.
Sometimes it’s better to leave Backdoor un-upgraded so you can draw heavily on turn one and set the entire run up immediately.
If you already like Assassin Burst, this is the natural evolution.
Mist Clearing Spam (ver1.0.2)
Essential Cards
- Mist Clear
- Ascend
- Mist Buff
- Oxalis’ Prayer
Required Upgrades
- Oxalis’ Prayer
You build hand size, then chain
Oxalis’ Prayer → Ascend → Mist Buff
to generate absurd numbers of high-damage, 0-cost Mist Clears.
Any draw engine works here, but Heat Burn feels especially good.
The sound effects alone make this deck worth playing.
After version 1.0.3, Mist Buff became much stronger, so this archetype is even more appealing now.
Procyon (ver1.0.2)
Required Cards
- Procyon Device
- Homeward Journey
- Iron
- Axim Core
Required Upgrades
- Procyon Device
- Homeward Journey
- Iron
You multiply Iron, then let Procyon Device slowly grind the enemy down through repeated triggers.
This deck can unlock achievements, but it’s fragile.
Iron alone causes accidents, so you need discard-cost generators like Heat Burn to keep things stable.
Honestly, this deck is not recommended unless you know what you’re doing.
If you’re confident, aiming for an infinite loop with upgraded Kannazuki Tea Party and Axim Core is much stronger.
Stability-Oriented Procyon (ver1.0.2)
Required Cards
- Procyon Device
- Immortal Flower
- Iron
- Genetic Mutation
- Backdoor
Required Upgrades
- Procyon Device
- Iron
This version focuses on minimizing deck consumption and maximizing play count.
You mass-produce Iron using Immortal Flower or Genetic Mutation, then slowly scale damage with Procyon Device.
Duplicating Procyon Device via Backdoor feels incredible and makes achievements very easy.
It’s a long fight deck, but surprisingly resistant to cost-based interference.
Best for players who want to explore Procyon without chasing infinite loops.
Iron Multiplication Mass Discharge (ver1.0.2)
Required Cards
- SOC Discharge
- Iron
- Homeward Journey
- Genetic Mutation
- All-In
Required Upgrades
- SOC Discharge
- Iron
- All-In
You discard Iron with Genetic Mutation to grow the deck, farm plays with Immortal Flower or Ferocious Claws, then unload everything into SOC Discharge.
Running three All-In massively reduces accident rates and is strongly recommended.
Setup takes time, and boss interference must be handled carefully.
D-rex is especially brutal here.
After version 1.0.3 buffs, this deck shifted from discharge-focused to basically an Immortal Flower monster.
A Reckless Plan (ver1.0.3)
Required Cards
- Reckless Plan
- Backdoor
Required Upgrades
- Reckless Plan
- Backdoor
Backdoor duplicates the Rapid Charge skill, which turns Reckless Plan into an absolute monster.
If you can snowball properly during Captain and Azwen fights, the payoff is deleting everything afterward in one hit.
Early-game damage should be covered by strong standalone cards like:
- Nelkar’s Experiment → BAS
- Backdoor → Double-Edged Sword
- Laevateinn
High risk, very high reward.
Flower Dance (ver1.0.3)
Required Cards
- Immortal Flower
- Homeward Journey
- Procyon Device
Required Upgrades
- Immortal Flower
This deck exists because Immortal Flower became absurdly strong in version 1.0.3.
You use Homeward Journey to mass-produce Eternal Loyalty, then leverage the long setup with Procyon Device.
Oxalis’ Prayer works well here, especially with three un-upgraded copies to create a semi-loop.
Recommended if you want to experience the newer balance direction of the game.
Trampling Heavy Blow (ver1.0.2)
Required Cards
- Heavy Blow
- Aggressive Ray
- Anti-Material
- Kannazuki Tea Party
Required Upgrades
- Heavy Blow
- Kannazuki Tea Party
This was the deck that fully cleared BIAS20 and defeated the training dummy.
You stack Aggressive Ray and Anti-Material, then bypass Heavy Blow’s cost using Kannazuki Tea Party and spam it endlessly.
After version 1.0.3, Heavy Blow was heavily nerfed.
It’s still strong, but no longer a brainless win button.
If you’re struggling with BIAS20, it’s still worth trying, just expect to actually think now.