How to use

pay

method

in

mage.abilities.costs.common.ExileTargetCost

  @Override
  public boolean apply(Game game, Ability source) {
    Player player = game.getPlayer(source.getControllerId());
    Permanent permanent = source.getSourcePermanentIfItStillExists(game);
    if (player == null || permanent == null) {
      return false;
    }
    FilterControlledPermanent filter = new FilterControlledPermanent("tokens created with " + permanent.getName());
    filter.add(new TetravusPredicate(new MageObjectReference(permanent, game)));
    filter.add(TokenPredicate.instance);
    ExileTargetCost cost = new ExileTargetCost(new TargetControlledPermanent(0, Integer.MAX_VALUE, filter, true));
    if (cost.pay(source, game, source.getSourceId(), player.getId(), true)) {
      return new AddCountersSourceEffect(CounterType.P1P1.createInstance(cost.getPermanents().size())).apply(game, source);
    }
    return false;
  }
}