Games like Draft of Darkness
Games like Draft of Darkness include Slay the Spire, Slay the Spire 2, Balatro, Vampire Crawlers: The Turbo Wildcard from Vampire Survivors, and Wildfrost. We matched them by the tags players give Draft of Darkness on Steam (Roguelike Deckbuilder, Survival Horror, Dungeon Crawler, Card Battler, and Perma Death): closest matches first, and among equally close ones the better-known games.

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

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

Balatro
Shared: Roguelike Deckbuilder · Card Game · Deckbuilding

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

Wildfrost
Shared: Roguelike Deckbuilder · Card Battler · Card Game

Monster Train
Shared: Card Battler · Deckbuilding · Card Game

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

Inscryption
Shared: Card Battler · Deckbuilding · Card Game

Across the Obelisk
Shared: Roguelike Deckbuilder · Turn-Based Strategy · Card Battler

9 Kings
Shared: Roguelike Deckbuilder · Deckbuilding · Strategy

Dicey Dungeons
Shared: Roguelike Deckbuilder · Card Battler · Deckbuilding

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

Hadean Tactics
Shared: Roguelike Deckbuilder · Card Battler · Dungeon Crawler

Trials of Fire
Shared: Card Battler · Dungeon Crawler · Roguelike Deckbuilder

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

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

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

LONESTAR
Shared: Roguelike Deckbuilder · Card Battler · Turn-Based Strategy

Monster Train 2
Shared: Roguelike Deckbuilder · Deckbuilding · Card Game

Deep Sky Derelicts
Shared: Roguelike Deckbuilder · Card Battler · Deckbuilding

SpellRogue
Shared: Roguelike Deckbuilder · Card Battler · Deckbuilding

Vault of the Void
Shared: Roguelike Deckbuilder · Card Battler · Deckbuilding

DICEOMANCER
Shared: Roguelike Deckbuilder · Card Battler · Card Game

Touhou: Lost Branch of Legend
Shared: Roguelike Deckbuilder · Card Battler · Deckbuilding