However, ignoring the vertical space—the 'Z-axis' of the arena—is a fatal flaw that will immediately stall your progression on the competitive ladder.

Flying units operate under a completely different set of physical rules than ground units.
Why the Skies Matter
The Balloon will simply float over your defending ground troops, drop a single bomb, and instantly delete a massive chunk of your tower's health.

Furthermore, aerial swarms (like the Minion Horde or Bats) can completely shred an unsupported ground tank in seconds.
Never build a deck with only one anti-air card.Flying anti-air units (like Mega Minion) are safer because they avoid ground melee.Always space your anti-air units apart. Structuring Your Defense
A mathematically sound deck requires at least two reliable anti-air units and one spell capable of hitting air targets.

Choosing the correct combination of these three roles ensures that you are never caught without an answer when the opponent takes flight.
The DangerThe Counter-PlayThe Lava Hound (Massive flying tank)Ignore it initially; focus all anti-air on the support troops behind it, then clear the 'pups' when it popsThe Inferno Dragon (Escalating beam damage)Use an Electro Wizard or Zap spell to constantly stun it and reset its damage beam to zero Total Coverage
Test your new decks specifically against heavy air combinations before taking them to the ranked ladder.

When the shadow of a Balloon falls across your tower, you must be ready.

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