Games like Arcanum Collegium
Games like Arcanum Collegium include Slay the Spire, Stacklands, Balatro, Slay the Spire 2, and Ratropolis. We matched them by the tags players give Arcanum Collegium on Steam (Card Battler, Strategy, Roguelite, Card Game, and Turn-Based Strategy): closest matches first, and among equally close ones the better-known games.

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

Stacklands
Shared: Card Game · Card Battler · Roguelite

Balatro
Shared: Card Game · Strategy · Roguelite

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

Ratropolis
Shared: Card Battler · Roguelite · Strategy

Inscryption
Shared: Card Battler · Card Game · Roguelite

Monster Train
Shared: Card Battler · Roguelite · Card Game

Griftlands
Shared: Card Battler · Roguelite · Card Game

Cross Blitz
Shared: Roguelite · Card Battler · Card Game

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

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

9 Kings
Shared: Strategy · Card Game · Roguelite

Wildfrost
Shared: Card Battler · Card Game · Roguelite

NEOVERSE
Shared: Card Battler · Roguelite · Turn-Based Strategy

Super Fantasy Kingdom
Shared: Strategy · Roguelite · Card Game

Stray Path
Shared: Card Battler · Strategy · Roguelite

Ballionaire
Shared: Strategy · 2D · Roguelite

Game Dev Tycoon
Shared: Strategy · Casual · Management

DICEOMANCER
Shared: Strategy · Card Battler · Card Game

None Shall Intrude
Shared: Strategy · Card Battler · Card Game

Roguebook
Shared: Card Game · Strategy · Roguelite

Dicey Dungeons
Shared: Card Battler · Roguelite · Strategy

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

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