Games like Fomon
Games like Fomon include Magic: The Gathering Arena, GWENT: The Witcher Card Game, Animation Throwdown: The Quest for Cards, Shadowverse: Worlds Beyond, and Slay the Spire 2. We matched them by the tags players give Fomon on Steam (Trading Card Game, Card Game, Strategy, Card Battler, and 2D): closest matches first, and among equally close ones the better-known games.

Magic: The Gathering Arena
Shared: Card Game · Strategy · Trading Card Game

GWENT: The Witcher Card Game
Shared: Card Game · Strategy · Trading Card Game

Animation Throwdown: The Quest for Cards
Shared: Trading Card Game · Card Game · Card Battler

Shadowverse: Worlds Beyond
Shared: Trading Card Game · Card Battler · Strategy

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

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

Inscryption
Shared: Card Game · Card Battler · Dark

The Bazaar
Shared: Strategy · Card Game · Card Battler

Yu-Gi-Oh! Legacy of the Duelist
Shared: Card Game · Card Battler · Trading Card Game

9 Kings
Shared: Strategy · Card Game · Card Battler

Balatro
Shared: Card Game · Strategy · Card Battler

Ratropolis
Shared: 2D · Card Battler · Strategy

Gordian Quest
Shared: Card Game · Strategy · Card Battler

Stacklands
Shared: Card Game · Card Battler · Strategy

Super Fantasy Kingdom
Shared: Strategy · Card Game · Fantasy

Cardfight!! Vanguard Dear Days 2
Shared: Strategy · Card Game · Trading Card Game

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

Monster Train
Shared: Card Game · Card Battler · Strategy

Griftlands
Shared: Card Battler · Card Game · Strategy

Yu-Gi-Oh! Legacy of the Duelist : Link Evolution
Shared: Trading Card Game · Card Game · Card Battler

Ascension: Deckbuilding Game
Shared: Card Battler · Card Game · Trading Card Game

Chrono CCG
Shared: Card Game · Trading Card Game · Card Battler

Morimens
Shared: Card Battler · Card Game · Strategy

Cross Blitz
Shared: Card Game · Card Battler · Strategy