One Turn Kill Best Deck Builds for Every Difficulty

The three top setups in One Turn Kill are the Heavy Blow cost stacker, the Axim Core infinite loop, and the BAS Nelkar Experiment burst. Each archetype uses card draw as operational energy to defeat encounters in a single sequence.

As stated on the Steam store page:

One Turn Kill is a PvE card game where card drawing and deck control are the keys to victory. — the Steam store page

Every match requires reducing the enemy HP to zero during your opening turn, as ending the turn results in an immediate loss. Because drawing cards serves as the resource cost for actions, successful deck building revolves around generating card advantage, discounting action costs, and stacking multipliers before the draw pile empties.

Which Archetypes Dominate the One Turn Kill Meta?

The Heavy Blow engine is a cost-scaling strategy that converts high card draw penalties into direct offensive output. Heavy Blow increases its damage based on the total cost of cards held in your hand, and hitting 50 or more attack grants a bonus strike. By pairing it with cards that raise hand cost, such as Aggressive Ray or Anti-Material, a single upgraded Heavy Blow hits for well over 300 damage twice.

To prevent high-cost cards from bricking your ability to draw, Kannazuki's Tea Party reduces selected cards to 0 cost. This interaction allows you to retain a hand full of expensive cards while executing Heavy Blow for free. Players clearing BIAS 20 consistently use three copies of Heavy Blow, three copies of Kannazuki's Tea Party, and high-draw enablers to wipe Lv5 encounters before enemy mechanics trigger.

Heavy Blow Core Cards

• 3x Heavy Blow (Upgraded)
• 3x Kannazuki's Tea Party (Upgraded)
• 3x Aggressive Ray or Anti-Material
• 1x to 2x Homeward Bound
• 1x to 2x Backdoor

Axim Core Infinite Loop Build

An Axim Core loop is a recycling setup that generates hand advantage and deck size mid-battle. Axim Core costs 20 draws by default and copies four random cards from your deck into your hand. When discounted using upgraded Kannazuki's Tea Party or triggered through Backdoor and Homeward Bound, Axim Core duplicates itself alongside support actions, rapidly expanding a 20-card deck into hundreds of resources.

Players combine this duplication loop with Procyon Device, which deals direct damage each time an attack or skill resolves at the cost of discarding cards. Running Undying Flower alongside the loop steadily introduces Eternal Loyalty cards into rotation, which deal 30 damage for 2 cost and reshuffle copies upon use. This approach bypasses high boss HP pools and serves as the primary method to defeat the 99,999 HP scarecrow in training mode, as recorded in Zent130's strategy notes.

Axim Loop Core Cards

• 3x Axim Core (Upgraded)
• 3x Kannazuki's Tea Party (Upgraded)
• 3x Procyon Device (Upgraded)
• 3x Undying Flower (Upgraded)
• 2x Backdoor

BAS and Nelkar Experiment Burst Deck

The BAS engine is a low-risk archetype suited for standard progression and early BIAS farming. BAS costs 0 draw and strikes three separate times when upgraded. Because each separate hit inherits damage buffs, combining BAS with Nelkar's Experiment produces high returns. Nelkar's Experiment adds 15 attack to cards in hand, increasing the total output of an upgraded BAS by 45 damage per cast.

Intuition provides card draw while applying a flat damage buff across all cards in hand. By cycling through your deck with Fog Clearing or Dew Sharpening, applying three Nelkar's Experiment buffs, and copying BAS with the Double skill, you can deliver over 600 damage without paying high deck costs. This configuration remains effective through BIAS 15 to secure the story ending without relying on complex infinite chains.

BAS Burst Core Cards

• 3x BAS (Upgraded)
• 3x Nelkar's Experiment (Upgraded)
• 3x Intuition (Upgraded)
• 2x Double-Edged Sword
• 2x Oxalis's Prayer

How Do You Select the Right Deck for Each Run?

Selecting an archetype depends on the enemy lineup and the initial active skills obtained after the first fight. Bosses introduce distinct interference rules: Captain Lv4 applies Fragile to your hand, Azwen Lv3 floods your deck with Overload cards, D-rex Lv1 enforces a 40-second real-time timer, and Bulk Lv3 places seals on your hand.

Investing upgrade chips into key cost-reduction cards like Kannazuki's Tea Party alters how your deck handles these mechanics. For example, Bulk's seals are avoided by returning cards to the draw pile with Transcode, while D-rex's timer is managed using the Downclock skill to halt movement for three card plays.

Acquiring the Double skill early allows you to duplicate key finishers like BAS or Backdoor, while Downclock provides the necessary safety margin against high-speed threats. Tailoring your 20-card list around one focused interaction provides the consistency required to secure victory in a single turn.