Program: 159400
Project: 159400
Buggy source:
@Override public boolean apply(Game game,Ability source){
  Player player=game.getPlayer(source.getControllerId());
  if (player != null) {
    for (int i=0; i < source.getManaCostsToPay().getX(); i++) {
      if (player != null && player.getLibrary().size() > 0) {
        Card topCard=player.getLibrary().getFromTop(game);
        topCard.moveToExile(source.getSourceId(),"String_Node_Str",source.getId(),game);
      }
    }
    ExileZone epicExperimentExileZone=game.getExile().getExileZone(source.getSourceId());
    filter.add(new ConvertedManaCostPredicate(Filter.ComparisonType.LessThan,source.getManaCostsToPay().getX() + 1));
    filter.setMessage("String_Node_Str" + source.getManaCostsToPay().getX() + "String_Node_Str");
    while (player != null && epicExperimentExileZone != null && epicExperimentExileZone.count(filter,game) > 0 && player.chooseUse(Outcome.PlayForFree,"String_Node_Str",game)) {
      TargetCardInExile target=new TargetCardInExile(filter,source.getSourceId());
      while (epicExperimentExileZone.count(filter,game) > 0 && player.choose(Outcome.PlayForFree,epicExperimentExileZone,target,game)) {
        Card card=game.getCard(target.getFirstTarget());
        if (card != null) {
          if (player.cast(card.getSpellAbility(),game,true)) {
            game.getExile().removeCard(card,game);
          }
        }
        target.clearChosen();
      }
    }
    UUID exileId=source.getSourceId();
    ExileZone exile=game.getExile().getExileZone(exileId);
    if (exile != null) {
      exile=exile.copy();
      for (      UUID cardId : exile) {
        Card card=game.getCard(cardId);
        card.moveToZone(Zone.GRAVEYARD,source.getSourceId(),game,true);
      }
      game.getExile().getExileZone(exileId).clear();
    }
    return true;
  }
  return false;
}

Fixed version (ground truth):
@Override public boolean apply(Game game,Ability source){
  Player controller=game.getPlayer(source.getControllerId());
  if (controller != null) {
    for (int i=0; i < source.getManaCostsToPay().getX(); i++) {
      if (controller.getLibrary().size() > 0) {
        Card topCard=controller.getLibrary().getFromTop(game);
        controller.moveCardToExileWithInfo(topCard,source.getSourceId(),"String_Node_Str",source.getSourceId(),game,Zone.LIBRARY);
      }
    }
    ExileZone epicExperimentExileZone=game.getExile().getExileZone(source.getSourceId());
    FilterCard filter=filterStatic.copy();
    filter.add(new ConvertedManaCostPredicate(Filter.ComparisonType.LessThan,source.getManaCostsToPay().getX() + 1));
    filter.setMessage("String_Node_Str" + source.getManaCostsToPay().getX() + "String_Node_Str");
    while (epicExperimentExileZone != null && epicExperimentExileZone.count(filter,game) > 0 && controller.chooseUse(Outcome.PlayForFree,"String_Node_Str",game)) {
      TargetCardInExile target=new TargetCardInExile(filter,source.getSourceId());
      while (epicExperimentExileZone.count(filter,game) > 0 && controller.choose(Outcome.PlayForFree,epicExperimentExileZone,target,game)) {
        Card card=game.getCard(target.getFirstTarget());
        if (card != null) {
          if (controller.cast(card.getSpellAbility(),game,true)) {
            game.getExile().removeCard(card,game);
          }
        }
        target.clearChosen();
      }
    }
    ExileZone exile=game.getExile().getExileZone(source.getSourceId());
    if (exile != null) {
      for (      Card card : exile.getCards(game)) {
        controller.moveCardToGraveyardWithInfo(card,source.getSourceId(),game,Zone.EXILED);
      }
    }
    return true;
  }
  return false;
}