Games like Ortus Regni
Games like Ortus Regni include Magic: The Gathering Arena, SMITE®, GWENT: The Witcher Card Game, Shadowverse: Worlds Beyond, and Mount & Blade II: Bannerlord. We matched them by the tags players give Ortus Regni on Steam (Free to Play, Strategy, Indie, Card Game, and Medieval): closest matches first, and among equally close ones the better-known games.

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

SMITE®
Shared: Free to Play · Strategy · Competitive

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

Shadowverse: Worlds Beyond
Shared: Free to Play · Strategy · Competitive

Mount & Blade II: Bannerlord
Shared: Strategy · Medieval · Indie

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

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

Marvel Rivals
Shared: Free to Play · Competitive · Strategy

Balatro
Shared: Card Game · Strategy · Indie

Reigns
Shared: Indie · Card Game · Medieval

Age of Conquest IV
Shared: Free to Play · Strategy · Indie

Idle Champions of the Forgotten Realms
Shared: Free to Play · Strategy · Indie

Slay the Spire
Shared: Card Game · Strategy · Indie

Crusader Kings II
Shared: Strategy · Medieval · Free to Play

Blood of Steel
Shared: Free to Play · Strategy · Medieval

Chrono CCG
Shared: Free to Play · Card Game · Strategy

Choice of Life: Middle Ages
Shared: Card Game · Strategy · Indie

Library Of Ruina
Shared: Strategy · Card Game · Indie

Age of Empires II (Retired)
Shared: Strategy · Medieval · Competitive

Where Winds Meet
Shared: Free to Play · Strategy · Indie

King Arthur's Gold
Shared: Indie · Medieval · Free to Play

Gremlins, Inc.
Shared: Strategy · Card Game · Competitive

Banished
Shared: Strategy · Indie · Medieval

Aimlabs
Shared: Free to Play · Indie · Competitive