If you ask any professional player what the single most important skill in an arena battler is, they will all give you the exact same answer.

Playing the game without knowing how much elixir your opponent has is like playing poker without looking at the cards on the table.
The Elixir Advantage
However, if you launch that exact same 8-elixir push when you know the opponent has only 2 elixir, it is mathematically impossible for them to stop it.

This situation—having significantly more energy than the opponent—is known as an 'Elixir Advantage', and creating it is the primary goal of the game.
Play safe until you know the math.If you are up by 4, launch your win condition immediately.If you are DOWN in elixir, play hyper-defensively. Mental Arithmetic Under Pressure
You must train your brain to do it subconsciously, starting with simple approximations before moving to exact numbers.

When they drop a heavy card, like a P.E. If you are you looking for more information regarding tower rush check out our web site. K.K.A (7 elixir), tell yourself "They are now Low Elixir."
Game PhaseThe MathTracking DifficultySingle Elixir (First 2 Minutes)1 Elixir every 2.8 secondsEasy to Moderate; plenty of time to calculate trades and track generation in your headDouble Elixir (Final Minute)1 Elixir every 1.4 secondsExtremely Difficult; the math changes so fast you must rely on instinct and 'feel' rather than raw numbers The Invisible Scoreboard
The elixir bar is the true, invisible scoreboard that dictates who is actually in control of the match.

When you perfectly predict an opponent's inability to defend your push based purely on your mental calculation, you will feel invincible.