What is Elixir Trade in Clash Royale?

An Elixir Trade (also called a positive elixir trade) occurs when you spend less elixir to counter an opponent's card than they spent to play it. For example, using a 2-elixir Fireball to counter a 4-elixir Musketeer results in a +2 elixir trade. Mastering elixir trades is essential for gaining advantages and winning matches.