Games like Slumber Realm
Games like Slumber Realm include Slay the Spire, Balatro, Slay the Spire 2, Dicey Dungeons, and Astrea: Six-Sided Oracles. We matched them by the tags players give Slumber Realm on Steam (Dice, Roguelike Deckbuilder, Card Battler, Deckbuilding, and Roguelite): closest matches first, and among equally close ones the better-known games.

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

Balatro
Shared: Roguelike Deckbuilder · Card Game · Deckbuilding

Slay the Spire 2
Shared: Deckbuilding · Roguelike Deckbuilder · Card Game

Dicey Dungeons
Shared: Roguelike Deckbuilder · Card Battler · Deckbuilding

Astrea: Six-Sided Oracles
Shared: Dice · Roguelike Deckbuilder · Card Battler

Wildfrost
Shared: Roguelike Deckbuilder · Card Battler · Card Game

9 Kings
Shared: Roguelike Deckbuilder · Deckbuilding · Card Game

Monster Train
Shared: Card Battler · Roguelite · Deckbuilding

Die in the Dungeon
Shared: Deckbuilding · Roguelike Deckbuilder · Card Game

DICEOMANCER
Shared: Card Battler · Roguelike Deckbuilder · Card Game

Inscryption
Shared: Card Battler · Deckbuilding · Card Game

Griftlands
Shared: Card Battler · Deckbuilding · Roguelite

Dungeons & Degenerate Gamblers
Shared: Roguelike Deckbuilder · Deckbuilding · Card Battler

Dice & Fold
Shared: Card Battler · Roguelike Deckbuilder · Dice

SpellRogue
Shared: Dice · Roguelike Deckbuilder · Deckbuilding

Yao-Guai Hunter
Shared: Roguelike Deckbuilder · Card Battler · Card Game

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

Breachway
Shared: Roguelike Deckbuilder · Deckbuilding · Card Game

My Card Is Better Than Your Card!
Shared: Deckbuilding · Roguelike Deckbuilder · Card Game

Roguebook
Shared: Deckbuilding · Card Game · Roguelite

Ratropolis
Shared: Card Battler · Deckbuilding · Roguelite

Super Fantasy Kingdom
Shared: Roguelite · Roguelike Deckbuilder · Deckbuilding

Black Jacket
Shared: Roguelike Deckbuilder · Card Game · Deckbuilding

As We Descend
Shared: Roguelike Deckbuilder · Card Battler · Deckbuilding