Program: 112862
Project: 112862
Buggy source:
/** 
 * Hellfire Deals 3 damage to all characters
 * @param thisCardIndex The index (position) of the card in the hand
 * @param playerIndex The index of the target player.  0 if targeting yourself or your own minions, 1 if targeting the enemy
 * @param minionIndex The index of the target minion.
 * @param boardState The BoardState before this card has performed its action.  It will be manipulated and returned.
 * @return The boardState is manipulated and returned
 */
@Override protected HearthTreeNode<BoardState> use_core(int thisCardIndex,int playerIndex,int minionIndex,HearthTreeNode<BoardState> boardState,Deck deck) throws HSInvalidPlayerIndexException {
  if (playerIndex > 0 || minionIndex > 0)   return null;
  HearthTreeNode<BoardState> toRet=boardState;
  boardState.data_.getHero_p1().takeDamage(DAMAGE_AMOUNT,0,0,0,boardState,deck);
  for (int indx=0; indx < boardState.data_.getNumMinions_p1(); ++indx) {
    Minion targetMinion=boardState.data_.getMinion_p1(indx);
    targetMinion.takeDamage(DAMAGE_AMOUNT,0,1,indx + 1,boardState,deck,true);
  }
  boardState.data_.getHero_p0().takeDamage(DAMAGE_AMOUNT,0,0,0,boardState,deck);
  for (int indx=0; indx < boardState.data_.getNumMinions_p0(); ++indx) {
    Minion targetMinion=boardState.data_.getMinion_p0(indx);
    targetMinion.takeDamage(DAMAGE_AMOUNT,0,0,indx + 1,boardState,deck,true);
  }
  Iterator<Minion> iter=boardState.data_.getMinions_p0().iterator();
  while (iter.hasNext()) {
    Minion targetMinion=iter.next();
    if (targetMinion.getHealth() <= 0) {
      iter.remove();
    }
  }
  iter=boardState.data_.getMinions_p1().iterator();
  while (iter.hasNext()) {
    Minion targetMinion=iter.next();
    if (targetMinion.getHealth() <= 0) {
      iter.remove();
    }
  }
  return super.use_core(thisCardIndex,playerIndex,minionIndex,boardState,deck);
}

Fixed version (ground truth):
/** 
 * Hellfire Deals 3 damage to all characters
 * @param thisCardIndex The index (position) of the card in the hand
 * @param playerIndex The index of the target player.  0 if targeting yourself or your own minions, 1 if targeting the enemy
 * @param minionIndex The index of the target minion.
 * @param boardState The BoardState before this card has performed its action.  It will be manipulated and returned.
 * @return The boardState is manipulated and returned
 */
@Override protected HearthTreeNode<BoardState> use_core(int thisCardIndex,int playerIndex,int minionIndex,HearthTreeNode<BoardState> boardState,Deck deck) throws HSInvalidPlayerIndexException {
  if (playerIndex > 0 || minionIndex > 0)   return null;
  HearthTreeNode<BoardState> toRet=boardState;
  boardState.data_.getHero_p1().takeDamage(DAMAGE_AMOUNT,0,0,0,boardState,deck,true);
  for (int indx=0; indx < boardState.data_.getNumMinions_p1(); ++indx) {
    Minion targetMinion=boardState.data_.getMinion_p1(indx);
    targetMinion.takeDamage(DAMAGE_AMOUNT,0,1,indx + 1,boardState,deck,true);
  }
  boardState.data_.getHero_p0().takeDamage(DAMAGE_AMOUNT,0,0,0,boardState,deck,true);
  for (int indx=0; indx < boardState.data_.getNumMinions_p0(); ++indx) {
    Minion targetMinion=boardState.data_.getMinion_p0(indx);
    targetMinion.takeDamage(DAMAGE_AMOUNT,0,0,indx + 1,boardState,deck,true);
  }
  Iterator<Minion> iter=boardState.data_.getMinions_p0().iterator();
  while (iter.hasNext()) {
    Minion targetMinion=iter.next();
    if (targetMinion.getHealth() <= 0) {
      iter.remove();
    }
  }
  iter=boardState.data_.getMinions_p1().iterator();
  while (iter.hasNext()) {
    Minion targetMinion=iter.next();
    if (targetMinion.getHealth() <= 0) {
      iter.remove();
    }
  }
  return super.use_core(thisCardIndex,playerIndex,minionIndex,boardState,deck);
}