Player player = game.getPlayer(source.getControllerId());
if (sacrificedPermanent != null && player != null) {
int newConvertedCost = sacrificedPermanent.getManaCost().convertedManaCost() + 1;
FilterCard filter = new FilterCard("creature card with converted mana cost " + newConvertedCost);
filter.add(new ConvertedManaCostPredicate(Filter.ComparisonType.Equal, newConvertedCost));
filter.add(new CardTypePredicate(CardType.CREATURE));
TargetCardInLibrary target = new TargetCardInLibrary(filter);
if (player.searchLibrary(target, game)) {
for (UUID cardId : target.getTargets()) {
Card card = player.getLibrary().getCard(cardId, game);
if (card != null) {