How to use

OpponentsLostLifeCount

in

mage.abilities.dynamicvalue.common

@Override
public boolean apply(Game game, Ability source, Ability abilityToModify) {
  Ability spellAbility = abilityToModify;
  if (spellAbility != null) {
    OpponentsLostLifeCount dynamicValue = new OpponentsLostLifeCount();
    int amount = dynamicValue.calculate(game, source, this);
    if (amount > 0) {
      CardUtil.reduceCost(spellAbility, amount);
      return true;
    }
  }
  return false;
}

@Override
public OpponentsLostLifeCount copy() {
  return new OpponentsLostLifeCount();
}

@Override
public int calculate(Game game, Ability sourceAbility, Effect effect) {
  return this.calculate(game, sourceAbility.getControllerId());
}

@Override
public Mana produceMana(boolean netMana, Game game, Ability source) {
  return Mana.RedMana(new OpponentsLostLifeCount().calculate(game, source, this));
}

  @Override
  public boolean applies(GameEvent event, Ability source, Game game) {
    if (event.getSourceId().equals(source.getSourceId())) {
      if (new OpponentsLostLifeCount().calculate(game, source, this) == 0) {
        return true;
      }
    }
    return false;
  }
}

@Override
public boolean apply(Game game, Ability source) {
  Permanent permanent = game.getPermanentEntering(source.getSourceId());
  if (permanent != null) {
    int oll = new OpponentsLostLifeCount().calculate(game, source, this);
    if (oll > 0) {
      permanent.addCounters(CounterType.P1P1.createInstance(oll), source, game);
    }
    return true;
  }
  return false;
}

@Override
public boolean apply(Game game, Ability source) {
  Permanent permanent = game.getPermanentEntering(source.getSourceId());
  if (permanent != null) {
    int oll = new OpponentsLostLifeCount().calculate(game, source, this);
    if (oll > 0) {
      permanent.addCounters(CounterType.P1P1.createInstance(oll), source, game);
    }
    return true;
  }
  return false;
}