Games like Last Spell Book
Games like Last Spell Book include Monster Train, Inscryption, Slay the Spire, Slay the Spire 2, and Balatro. We matched them by the tags players give Last Spell Book on Steam (Card Battler, Turn-Based Tactics, Strategy, Roguelite, and Puzzle): closest matches first, and among equally close ones the better-known games.

Monster Train
Shared: Card Battler · Roguelite · Turn-Based Tactics

Inscryption
Shared: Card Battler · Card Game · Puzzle

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

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

Balatro
Shared: Strategy · Card Game · Roguelike

Wildfrost
Shared: Card Battler · Turn-Based Tactics · Roguelite

Vampire Crawlers: The Turbo Wildcard from Vampire Survivors
Shared: Card Battler · Strategy · Roguelike

LONESTAR
Shared: Turn-Based Tactics · Strategy · Card Battler

Dream of Corpse Lady
Shared: Card Battler · Strategy · Turn-Based Tactics

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

Cross Blitz
Shared: Roguelite · Card Battler · Strategy

9 Kings
Shared: Strategy · Card Game · Roguelite

Griftlands
Shared: Card Battler · Roguelite · Strategy

StarVaders
Shared: Turn-Based Tactics · Roguelite · Card Game

Ratropolis
Shared: Card Battler · Roguelite · Strategy

Mewgenics
Shared: Turn-Based Tactics · Roguelite · Turn-Based Strategy

One Step From Eden
Shared: Roguelite · Card Battler · Strategy

Touhou: Lost Branch of Legend
Shared: Card Battler · Strategy · Turn-Based Tactics

NEOVERSE
Shared: Card Battler · Roguelite · Strategy

As We Descend
Shared: Card Battler · Turn-Based Tactics · Roguelite

Stacklands
Shared: Card Battler · Roguelite · Card Game

Inkbound
Shared: Turn-Based Tactics · Roguelite · PvE

Roguebook
Shared: Strategy · Roguelite · Card Game

Fights in Tight Spaces
Shared: Strategy · Turn-Based Tactics · Action