Program: 112764
Project: 112764
Buggy source:
/** 
 * Battlecry: Destroy
 */
@Override public HearthTreeNode useUntargetableBattlecry_core(Minion minionPlacementTarget,HearthTreeNode boardState,Deck deckPlayer0,Deck deckPlayer1,boolean singleRealizationOnly) throws HSException {
  HearthTreeNode toRet=boardState;
  if (singleRealizationOnly) {
    if (toRet != null) {
      List<Minion> possibleTargets=new ArrayList<Minion>();
      for (      Minion minion : PlayerSide.WAITING_PLAYER.getPlayer(toRet).getMinions()) {
        if (minion.getTotalAttack() <= 2)         possibleTargets.add(minion);
      }
      if (possibleTargets.size() > 0) {
        Minion targetMinion=possibleTargets.get((int)(Math.random() * possibleTargets.size()));
        targetMinion.setHealth((byte)-99);
      }
    }
  }
 else {
    int placementTargetIndex=minionPlacementTarget instanceof Hero ? 0 : PlayerSide.CURRENT_PLAYER.getPlayer(boardState).getMinions().indexOf(minionPlacementTarget) + 1;
    int thisMinionIndex=PlayerSide.CURRENT_PLAYER.getPlayer(boardState).getMinions().indexOf(this) + 1;
    toRet=new RandomEffectNode(boardState,new HearthAction(HearthAction.Verb.USE_CARD,PlayerSide.CURRENT_PLAYER,thisMinionIndex,PlayerSide.CURRENT_PLAYER,placementTargetIndex));
    if (toRet != null) {
      List<Minion> possibleTargets=new ArrayList<Minion>();
      for (      Minion minion : PlayerSide.WAITING_PLAYER.getPlayer(toRet).getMinions()) {
        if (minion.getTotalAttack() <= 2)         possibleTargets.add(minion);
      }
      if (possibleTargets.size() > 0) {
        PlayerModel targetPlayer=PlayerSide.WAITING_PLAYER.getPlayer(toRet);
        for (        Minion possibleTarget : possibleTargets) {
          HearthTreeNode newState=new HearthTreeNode((BoardModel)toRet.data_.deepCopy());
          Minion targetMinion=PlayerSide.WAITING_PLAYER.getPlayer(newState).getMinions().get(targetPlayer.getMinions().indexOf(possibleTarget));
          targetMinion.setHealth((byte)-99);
          newState=BoardStateFactoryBase.handleDeadMinions(newState,deckPlayer0,deckPlayer1);
          toRet.addChild(newState);
        }
      }
    }
  }
  return toRet;
}

Fixed version (ground truth):
/** 
 * Battlecry: Destroy
 */
@Override public HearthTreeNode useUntargetableBattlecry_core(Minion minionPlacementTarget,HearthTreeNode boardState,Deck deckPlayer0,Deck deckPlayer1,boolean singleRealizationOnly) throws HSException {
  HearthTreeNode toRet=boardState;
  if (singleRealizationOnly) {
    if (toRet != null) {
      List<Minion> possibleTargets=new ArrayList<Minion>();
      for (      Minion minion : PlayerSide.WAITING_PLAYER.getPlayer(toRet).getMinions()) {
        if (minion.getTotalAttack() <= 2)         possibleTargets.add(minion);
      }
      if (possibleTargets.size() > 0) {
        Minion targetMinion=possibleTargets.get((int)(Math.random() * possibleTargets.size()));
        targetMinion.setHealth((byte)-99);
      }
    }
  }
 else {
    int placementTargetIndex=minionPlacementTarget instanceof Hero ? 0 : PlayerSide.CURRENT_PLAYER.getPlayer(boardState).getMinions().indexOf(minionPlacementTarget) + 1;
    int thisMinionIndex=PlayerSide.CURRENT_PLAYER.getPlayer(boardState).getMinions().indexOf(this) + 1;
    List<Minion> possibleTargets=new ArrayList<Minion>();
    for (    Minion minion : PlayerSide.WAITING_PLAYER.getPlayer(toRet).getMinions()) {
      if (minion.getTotalAttack() <= 2)       possibleTargets.add(minion);
    }
    if (possibleTargets.size() > 0) {
      toRet=new RandomEffectNode(boardState,new HearthAction(HearthAction.Verb.UNTARGETABLE_BATTLECRY,PlayerSide.CURRENT_PLAYER,thisMinionIndex,PlayerSide.CURRENT_PLAYER,placementTargetIndex));
      PlayerModel targetPlayer=PlayerSide.WAITING_PLAYER.getPlayer(toRet);
      for (      Minion possibleTarget : possibleTargets) {
        HearthTreeNode newState=new HearthTreeNode((BoardModel)toRet.data_.deepCopy());
        Minion targetMinion=PlayerSide.WAITING_PLAYER.getPlayer(newState).getMinions().get(targetPlayer.getMinions().indexOf(possibleTarget));
        targetMinion.setHealth((byte)-99);
        newState=BoardStateFactoryBase.handleDeadMinions(newState,deckPlayer0,deckPlayer1);
        toRet.addChild(newState);
      }
    }
  }
  return toRet;
}