You seem to believe this effect happens when you acquire the hero, and are asking if it happens when you play it. It's the other way around, a hero's effect triggers when it is played, not when it is acquired.
Monster effects are triggered when you defeat the monster, they happen once and the monster goes to the void.
Hero effects are triggered when the hero is played. Very few hero abilities happen when you acquire them, for example Rally occurs when you acquire a hero.
Constructs specify when their effects trigger, usually once per round, or when you play specific faction cards (like another mechana construct).