Games like Somnial Ouija
Games like Somnial Ouija include Slay the Spire, Slay the Spire 2, Inscryption, Balatro, and Griftlands. We matched them by the tags players give Somnial Ouija on Steam (Card Battler, Traditional Roguelike, Trading Card Game, Roguelite, and Card Game): closest matches first, and among equally close ones the better-known games.

Slay the Spire
Shared: Card Battler · Card Game · Roguelite

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

Inscryption
Shared: Card Battler · Card Game · Roguelite

Balatro
Shared: Card Game · Roguelike · Roguelite

Griftlands
Shared: Card Battler · Roguelite · Card Game

Monster Train
Shared: Card Battler · Roguelite · Card Game

9 Kings
Shared: Card Game · Roguelite · Roguelike

Dream of Corpse Lady
Shared: Card Battler · Card Game · Roguelite

Stacklands
Shared: Card Battler · Card Game · Roguelite

Black Book
Shared: Card Battler · Card Game · Roguelite

Heroes Wanted
Shared: Card Battler · Trading Card Game · Card Game

Dicey Dungeons
Shared: Card Battler · Roguelite · Card Game

NEOVERSE
Shared: Card Battler · Roguelite · Card Game

Super Fantasy Kingdom
Shared: Roguelite · Card Game · Roguelike

Loop Hero
Shared: Roguelite · Roguelike · Card Game

Die in the Dungeon
Shared: Card Battler · Card Game · Roguelike

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

Chrono Ark
Shared: Roguelite · Card Game · Strategy

Dungeons & Degenerate Gamblers
Shared: Card Battler · Card Game · Roguelite

Journey to the West
Shared: Card Battler · Roguelite · Card Game

Tabletop Simulator
Shared: Board Game · Tabletop · Card Game

Roguebook
Shared: Card Game · Roguelite · Card Battler

RUNGORE
Shared: Trading Card Game · Card Battler · Card Game

Prime of Flames
Shared: Roguelite · Strategy RPG · Traditional Roguelike