There are few things more demoralizing in an arena battler than watching your opponent's massive tank completely regenerate its health bar.

This is exactly what the opponent wants; while you struggle to kill the Giant, the Healer is constantly undoing all your hard work.
Target Priority
If you successfully eliminate the support, the massive tank becomes a slow, expensive sitting duck that your towers can easily dispatch.

Alternatively, a perfectly timed heavy spell like a Fireball or Poison can instantly vaporize the support units while simultaneously damaging the tank.
Separate and conquer.Splash damage units are decent, but often lack the burst damage required.If you defend it cheaply, you win the game instantly. Countering the Gimmicks
A cloned healer essentially doubles the healing output, turning the surrounding army into a literal immortal wall of hitpoints.

The definitive counter to any Clone strategy is a cheap, instant-cast splash spell like the Log, Zap, or Snowball.
Support Unit TypeMechanicBest Counter StrategyAura HealerHeals herself and surrounding units every time she successfully lands a melee attackUse flying units she cannot hit, or drop a high-DPS unit directly on her head to kill her before she swingsTemporary ProtectionJumps onto a group of units, providing a massive, instant burst of healingPlace a cheap distraction unit (like skeletons) in its path to force it to trigger early, wasting the heal entirely Patience and Precision
Take a deep breath, identify the primary healer, and execute your assassination plan flawlessly.

Master the backline dive, and dominate the arena.

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