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.

However, simply throwing four random huts into a deck will not work; the strategy requires careful synergy, defensive anchors, and specific spell baiting to succeed.
The Foundation of the City
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.Stagger the spawn timers. Protecting the Engine
Furthermore, these fragile support units act as 'Spell Bait'; if the opponent uses their Fireball to kill your Flying Machine, your Goblin Hut is completely safe to generate infinite value.

If they drop a Wizard behind their tower to clear your goblins, you instantly Poison the Wizard and the tower simultaneously, gaining massive value.
Secondary UnitThe LogicFlying MachineSits safely behind the river, immune to ground units, forcing the opponent to use spells on it instead of the hutsMother WitchTurns enemy defensive swarms into your own offensive hogs, creating pure, unmanageable chaos on the board The Slow Crush
Playing a Spawner deck is not about making massive, flashy plays; it is about slow, methodical strangulation.

The siege never ends.

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