Choosing the correct combination of spells is arguably the most critical deck-building decision you will make, as they dictate your ability to finish games and secure positive trades.

A perfectly timed spell can save a crumbling defense or guarantee that your primary attacker connects with the enemy tower.
The Heavy Hitters: Nuking the Arena
Every viable competitive deck must include at least one 'heavy' or 'medium' damage spell, typically costing between 4 and 6 elixir.

Poison provides identical total damage but spreads it out over several seconds, making it the absolute hard-counter to continuous Spawner buildings or Graveyard spells.
Do not use 6 elixir to kill a single 4-elixir unit.Poison creates a zone of area denial.Only cast it when the enemy unit is stationary, or lead your target perfectly. The Rotational Spells
Because they are so cheap, you can cast them frequently to clear out cheap distractions without ruining your economy.

Arrows, costing 3 elixir, sit in the middle; they lack special utility effects (like stun or knockback) but offer a massive radius and enough damage to kill tougher swarms like Minions and Archers.
Spell CategoryOptimal ScenarioThe CardsSmall Swarm Clear (2-3 Elixir)Instantly killing cheap swarms for a positive trade and quickly cycling the deckThe Log, Zap, ArrowsUtility / Displacement (1-3 Elixir)Physically moving enemy units to group them up for splash damage or pulling them to the King towerTornado, Freeze, Clone Balancing Your Magic
Decks that run three spells (Triple Spell) are incredibly potent on defense but often lack the troop presence to mount a serious attack.

Choose your spells to perfectly cover the weaknesses of your primary win condition.

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