How to use

CastRedSpellThisTurnCondition

in

mage.cards.h

public HotheadedGiant(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{3}{R}");
  this.subtype.add(SubType.GIANT);
  this.subtype.add(SubType.WARRIOR);
  this.power = new MageInt(4);
  this.toughness = new MageInt(4);
  // Haste
  this.addAbility(HasteAbility.getInstance());
  // Hotheaded Giant enters the battlefield with two -1/-1 counters on it unless you've cast another red spell this turn.
  Condition condition = new CastRedSpellThisTurnCondition();
  this.addAbility(new EntersBattlefieldAbility(new ConditionalOneShotEffect(new AddCountersSourceEffect(CounterType.M1M1.createInstance(2)), new InvertCondition(condition), ""), "with two -1/-1 counters on it unless you've cast another red spell this turn"), new HotHeadedGiantWatcher(this.getId()));
}