By filling your side of the map with passive buildings that constantly generate cheap units, you force the opponent to spend all their elixir simply trying to survive.

If you enjoy slowly suffocating your opponents and watching them panic as the map fills with your troops, this guide is for you.
The Core Engine: Selecting Your Buildings
A true Spawner deck typically utilizes two or three distinct spawning buildings, each serving a different tactical purpose in the overall engine.

The Barbarian Hut is the heavy investment (often costing 7 elixir) and is usually played only in double elixir; it acts as an immovable defensive wall while generating massive, high-health pressure.
Never play your Barbarian Hut as the first card of the match.Protect your buildings at all costs.If your Goblin Hut and Furnace spawn at the exact same millisecond, they will clump together and die to one spell. Protecting the Engine
Because your buildings cost so much elixir, you must fill the rest of your deck with incredibly efficient, cheap defensive support units.

You also need a heavy spell of your own (usually Poison or Fireball) to destroy the opponent's defensive units that get stuck trying to clear your massive swarms.
The BuildingWhat it DoesThe GeometryGoblin Hut (5 Elixir)Constant anti-air chip damage and spell baitSafely behind the Princess tower or deep in the cornerFurnace (4 Elixir)Splash damage pressure and swarm controlAggressively in the center to pull tanks and pressure the bridge The Slow Crush
Playing a Spawner deck is not about making massive, flashy plays; it is about slow, methodical strangulation.

They will run out of spells long before you run out of troops.

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