How to use

getTargetPointer

method

in

mage.abilities.effects.common.CounterTargetEffect

@Override
public boolean apply(Game game, Ability source) {
  boolean countered = false;
  for (UUID targetId : getTargetPointer().getTargets(game, source)) {
    if (game.getStack().counter(targetId, source.getSourceId(), game)) {
      countered = true;
    }
  }
  return countered;
}