Games like Cubic Cosmos
Games like Cubic Cosmos include Slay the Spire, Slay the Spire 2, Balatro, Monster Train, and 9 Kings. We matched them by the tags players give Cubic Cosmos on Steam (Roguelike Deckbuilder, Deckbuilding, Card Battler, Roguelike, and Card Game): closest matches first, and among equally close ones the better-known games.

Slay the Spire
Shared: Roguelike Deckbuilder · Card Battler · Deckbuilding

Slay the Spire 2
Shared: Deckbuilding · Roguelike · Card Game

Balatro
Shared: Roguelike Deckbuilder · Deckbuilding · Roguelike

Monster Train
Shared: Card Battler · Deckbuilding · Card Game

9 Kings
Shared: Strategy · Roguelike · Deckbuilding

Wildfrost
Shared: Roguelike Deckbuilder · Card Battler · Card Game

Dicey Dungeons
Shared: Roguelike Deckbuilder · Deckbuilding · Card Battler

Die in the Dungeon
Shared: Deckbuilding · Roguelike · Roguelike Deckbuilder

Dungeons & Degenerate Gamblers
Shared: Roguelike Deckbuilder · Roguelike · Deckbuilding

Vampire Crawlers: The Turbo Wildcard from Vampire Survivors
Shared: Card Battler · Deckbuilding · Roguelike

Inscryption
Shared: Card Battler · Deckbuilding · Card Game

DICEOMANCER
Shared: Roguelike Deckbuilder · Card Battler · Card Game

Monster Train 2
Shared: Roguelike Deckbuilder · Deckbuilding · Roguelike

Super Fantasy Kingdom
Shared: Roguelike · Strategy · Deckbuilding

As We Descend
Shared: Roguelike Deckbuilder · Card Battler · Deckbuilding

Tower Tactics: Liberation
Shared: Roguelike Deckbuilder · Card Battler · Deckbuilding

Breachway
Shared: Deckbuilding · Roguelike · Roguelike Deckbuilder

Touhou: Lost Branch of Legend
Shared: Roguelike Deckbuilder · Card Battler · Roguelike

Astrea: Six-Sided Oracles
Shared: Roguelike Deckbuilder · Card Battler · Roguelike

Roguebook
Shared: Deckbuilding · Card Game · Strategy

LONESTAR
Shared: Roguelike · Roguelike Deckbuilder · Card Battler

Ratropolis
Shared: Deckbuilding · Card Battler · Strategy

Yao-Guai Hunter
Shared: Roguelike Deckbuilder · Card Game · Roguelike

Griftlands
Shared: Card Battler · Deckbuilding · Card Game