Games like Deckaroo
Games like Deckaroo include The Bazaar, 9 Kings, Legion TD 2 - Multiplayer Tower Defense, Slay the Spire 2, and Bloons TD 6. We matched them by the tags players give Deckaroo on Steam (Card Battler, Collectathon, Real Time Tactics, Auto Battler, and Strategy): closest matches first, and among equally close ones the better-known games.

The Bazaar
Shared: Card Battler · Auto Battler · Strategy

9 Kings
Shared: Strategy · Auto Battler · Card Game

Legion TD 2 - Multiplayer Tower Defense
Shared: Auto Battler · Tower Defense · Strategy

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

Bloons TD 6
Shared: Strategy · Tower Defense · Casual

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

Yu-Gi-Oh! Legacy of the Duelist
Shared: Card Battler · Card Game · Strategy

Inscryption
Shared: Card Battler · Card Game · Strategy

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

Backpack Battles
Shared: Auto Battler · Strategy · PvP

Overdungeon
Shared: Strategy · Card Battler · Casual

Ratropolis
Shared: Card Battler · Strategy · Real Time Tactics

Balatro
Shared: Card Game · Strategy · Card Battler

Esports Godfather
Shared: Card Battler · Strategy · Card Game

Animation Throwdown: The Quest for Cards
Shared: Card Battler · Strategy · Card Game

Shadowverse: Worlds Beyond
Shared: Card Battler · PvP · Strategy

Monster Train
Shared: Card Battler · Card Game · Strategy

Creeper World 4
Shared: Real Time Tactics · Tower Defense · Strategy

Who's Your Daddy?!
Shared: Strategy · Simulation · Funny

Totally Accurate Battle Simulator
Shared: Strategy · Simulation · Funny

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

Liars Bar
Shared: PvP · Casual · Indie

Bloons TD 5
Shared: Strategy · Tower Defense · Action

Men of War: Assault Squad 2
Shared: Strategy · Real Time Tactics · Action