Games like ORDER9
Games like ORDER9 include Othercide, GWENT: The Witcher Card Game, Buckshot Roulette, 9 Kings, and Ultimate Custom Night. We matched them by the tags players give ORDER9 on Steam (Strategy, Turn-Based Tactics, Auto Battler, Card Game, and 3D): closest matches first, and among equally close ones the better-known games.

Othercide
Shared: Strategy · Turn-Based Tactics · Indie

GWENT: The Witcher Card Game
Shared: Strategy · Card Game · Free to Play

Buckshot Roulette
Shared: Strategy · Dark · 3D

9 Kings
Shared: Strategy · Auto Battler · Card Game

Ultimate Custom Night
Shared: Strategy · Free to Play · Singleplayer

Balatro
Shared: Card Game · Strategy · Singleplayer

Mecharashi
Shared: Strategy · Turn-Based Tactics · 3D

Magic: The Gathering Arena
Shared: Strategy · Card Game · Free to Play

Esports Godfather
Shared: Strategy · Turn-Based Tactics · Card Game

Darkest Dungeon® II
Shared: Turn-Based Tactics · Dark Fantasy · Strategy

Sultan's Game
Shared: Strategy · Card Game · Singleplayer

Inscryption
Shared: Card Game · Strategy · Dark

Slay the Spire
Shared: Card Game · Strategy · Singleplayer

Dungeon 100
Shared: Auto Battler · Strategy · Card Game

Alpha League
Shared: Turn-Based Tactics · Auto Battler · Card Game

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

The Last Spell
Shared: Strategy · Turn-Based Tactics · Singleplayer

Brigandine The Legend of Runersia
Shared: Strategy · Turn-Based Tactics · Dark Fantasy

Tales & Tactics
Shared: Strategy · Auto Battler · Turn-Based Tactics

Armello
Shared: Strategy · Card Game · 3D

Warhammer 40,000: Battlesector
Shared: Strategy · Turn-Based Tactics · 3D

Into the Breach
Shared: Strategy · Turn-Based Tactics · Indie

Wretch: Divine Ascent
Shared: Strategy · Auto Battler · Turn-Based Tactics

Roguebook
Shared: Card Game · Strategy · Indie