Games like The Spewnicorn
Games like The Spewnicorn include Balatro, Slay the Spire, Slay the Spire 2, Inscryption, and Vampire Crawlers: The Turbo Wildcard from Vampire Survivors. We matched them by the tags players give The Spewnicorn on Steam (Card Game, Strategy, Deckbuilding, Roguelike, and Card Battler): closest matches first, and among equally close ones the better-known games.

Balatro
Shared: Card Game · Roguelike · Deckbuilding

Slay the Spire
Shared: Card Game · Roguelike · Deckbuilding

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

Inscryption
Shared: Card Game · Card Battler · Deckbuilding

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

Monster Train
Shared: Card Game · Card Battler · Deckbuilding

Magic: The Gathering Arena
Shared: Card Game · Strategy · Deckbuilding

9 Kings
Shared: Strategy · Card Game · Roguelike

Monster Train 2
Shared: Card Game · Deckbuilding · Roguelike

DICEOMANCER
Shared: Card Game · Strategy · Card Battler

Loop Hero
Shared: Roguelike · Deckbuilding · Card Game

Dicey Dungeons
Shared: Deckbuilding · Card Battler · Roguelike

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

Ratropolis
Shared: Deckbuilding · Strategy · Card Battler

Griftlands
Shared: Deckbuilding · Card Battler · Card Game

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

Super Fantasy Kingdom
Shared: Strategy · Roguelike · Card Game

The Bazaar
Shared: Strategy · Deckbuilding · Card Game

GWENT: The Witcher Card Game
Shared: Card Game · Strategy · Deckbuilding

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

Peglin
Shared: Deckbuilding · Roguelike · Strategy

Stacklands
Shared: Card Game · Strategy · Card Battler

RACCOIN: Coin Pusher Roguelike
Shared: Strategy · Deckbuilding · Roguelike

Cross Blitz
Shared: Deckbuilding · Card Game · Strategy