Antewise

Cobalt Core Deck Building Guide

Updated 20 Oct 2026 Source Synthesized from published Cobalt Core guides; rewritten in original wording on 20 October 2026 By

Deck size is the hidden difficulty setting. Every card you add lowers the chance of drawing the ones that carry a fight.

Consistency beats ceiling

A deck with one great play you rarely draw loses to a deck with several good plays you always draw.

Answer the timeline

Build to answer what enemies actually do: interruption, movement, and enough damage to kill attackers before their action lands.

Remove clutter

Card removal is one of the strongest rewards available. Removing a weak card is often better than adding a strong one.

Where to check the data

Frequently asked questions

When should I stop adding cards?

When a new card would not be in your top half. Reward screens are optional.

Are upgrades better than new cards?

Usually yes. Upgrades add power without adding variance.

Do artifacts change deck building?

They do. Check the [artifact database](/cobalt-core/artifacts-database/) and build toward the ones you hold.

More Cobalt Core guides

Sources

Figures and item data on this site are read from the game’s own reference wiki before publishing. Where a value could not be confirmed there, the page says so instead of filling the gap.