@Override public PaymentDecision visit(CostRemoveAnyCounter cost) { final String amount = cost.getAmount(); final int c = AbilityUtils.calculateAmount(source, amount, ability); final String type = cost.getType(); List<Card> typeList = CardLists.getValidCards( player.getCardsIn(ZoneType.Battlefield), type.split(";"), player, source); List<Card> hperms = CardLists.filter( typeList, new Predicate<Card>() { @Override public boolean apply(final Card crd) { for (final CounterType c1 : CounterType.values()) { if (crd.getCounters(c1) >= c && ComputerUtil.isNegativeCounter(c1, crd)) { return true; } } return false; } }); if (hperms.isEmpty()) return null; PaymentDecision result = PaymentDecision.card(hperms); Card valid = hperms.get(0); for (CounterType c1 : valid.getCounters().keySet()) { if (valid.getCounters(c1) >= c && ComputerUtil.isNegativeCounter(c1, valid)) { result.ct = c1; break; } } // Only find cards with enough negative counters // TODO: add ai for Chisei, Heart of Oceans return result; }