/** Activate the artifact. Check what the type is and activate the corresponding artifact */
 private void activate() {
   if (type == TYPE.ALLHELPERDAMAGE) {
     game.getHelpers().artifactDamage(currentAmount);
   } else if (type == TYPE.HERODAMAGE) {
     game.getHero().artifactDamage(currentAmount);
   } else if (type == TYPE.ENEMYGOLD) {
     game.artifactEnemyGold(currentAmount);
   }
 }