The elixir bar is not just a timer; it is the currency that dictates every single interaction on the battlefield.

Every time you place a card, you are making a financial transaction, betting your current energy against the opponent's available energy.
The Cost of Inaction
In standard gameplay, one unit of elixir is generated approximately every 2.8 seconds; in double elixir overtime, this rate increases to one unit every 1. If you're ready to see more about tower rush have a look at the web site. 4 seconds.

This is why top players are constantly 'cycling' cheap cards in the back of the arena; they are ensuring the generation timer never stops ticking.
Protect them fiercely.The 'first play' dilemma is real.Tracking generation is just as important as tracking spending. Winning the Economic War
You did not damage their tower, but you won a massive mathematical victory that will snowball into a tower later in the match.

Conversely, if you panic and use a Rocket (6 elixir) to kill a Princess (3 elixir), you have suffered a -3 negative trade.
Pro MoveHow it WorksPulling AggroUsing a 1-elixir Skeleton to pull a 4-elixir Mini P.E.K.K.A across the map until both Princess towers shoot it to death; +3 profitThe Spell Value CheckWaiting until the opponent places three different support troops near their tower before dropping the Rocket, destroying 12 elixir with 6; +6 profit The Invisible Scoreboard
To become a Grandmaster, you must develop a secondary mental process that constantly runs the math in the background of your mind.

The math is cold, unforgiving, and absolute.