How to use

apply

method

in

mage.abilities.effects.common.counter.RemoveCounterSourceEffect

  @Override
  public boolean apply(Game game, Ability source) {
    Player controller = game.getPlayer(source.getControllerId());
    if (controller == null) {
      return false;
    }
    MageObject sourceObject = source.getSourceObjectIfItStillExists(game);
    if (sourceObject instanceof Card) {
      Card card = (Card) sourceObject;
      new RemoveCounterSourceEffect(CounterType.EGG.createInstance()).apply(game, source);
      if (card.getCounters(game).getCount(CounterType.EGG) == 0) {
        controller.moveCards(card, Zone.BATTLEFIELD, source, game);
      }
      return true;
    }
    return false;
  }
}

  @Override
  public boolean apply(Game game, Ability source) {
    Player controller = game.getPlayer(source.getControllerId());
    Permanent sourcePermanent = game.getPermanent(source.getSourceId());
    if (controller != null && sourcePermanent != null) {
      if (!sourcePermanent.getCounters(game).containsKey(CounterType.PLAGUE) || controller.chooseUse(outcome, "Put a plague counter on? (No removes one)", source, game)) {
        return new AddCountersSourceEffect(CounterType.PLAGUE.createInstance(), true).apply(game, source);
      } else {
        return new RemoveCounterSourceEffect(CounterType.PLAGUE.createInstance()).apply(game, source);
      }
    }
    return false;
  }
}

  @Override
  public boolean apply(Game game, Ability source) {
    Player controller = game.getPlayer(source.getControllerId());
    Permanent sourcePermanent = game.getPermanent(source.getSourceId());
    if (controller != null && sourcePermanent != null) {
      if (!sourcePermanent.getCounters(game).containsKey(CounterType.CHARGE) || controller.chooseUse(outcome, "Put a charge counter on? (No removes one)", source, game)) {
        return new AddCountersSourceEffect(CounterType.CHARGE.createInstance(), true).apply(game, source);
      } else {
        return new RemoveCounterSourceEffect(CounterType.CHARGE.createInstance()).apply(game, source);
      }
    }
    return false;
  }
}

@Override
public boolean apply(Game game, Ability source) {
  Player controller = game.getPlayer(source.getControllerId());
  Permanent permanent = game.getPermanent(source.getSourceId());
  if (controller != null && permanent != null) {
    if (controller.flipCoin(source, game, true)) {
      game.informPlayers("Chaotic Goo: Won flip. Put a +1/+1 counter on Chaotic Goo.");
      new AddCountersSourceEffect(CounterType.P1P1.createInstance(1)).apply(game, source);
      return true;
    } else {
      game.informPlayers("Chaotic Goo: Lost flip. Remove a +1/+1 counter on Chaotic Goo.");
      new RemoveCounterSourceEffect(CounterType.P1P1.createInstance(1)).apply(game, source);
      return true;
      }
    }
  return false;
}

@Override
public boolean apply(Game game, Ability source) {
  Player controller = game.getPlayer(source.getControllerId());
  Permanent permanent = game.getPermanent(source.getSourceId());
  if (controller != null && permanent != null) {
    if (controller.flipCoin(source, game, true)) {
      game.informPlayers("Goblin Bomb: Won flip. Put a fuse counter on Goblin Bomb.");
      new AddCountersSourceEffect(CounterType.FUSE.createInstance(1)).apply(game, source);
      return true;
    } else {
      game.informPlayers("Goblin Bomb: Lost flip. Remove a fuse counter from Goblin Bomb.");
      new RemoveCounterSourceEffect(CounterType.FUSE.createInstance(1)).apply(game, source);
      return true;
    }
  }
  return false;
}