How to use

UnleashAbility

in

mage.abilities.keyword

@Override
public UnleashAbility copy() {
  return new UnleashAbility(this);
}

public UnleashAbility() {
  super(Zone.ALL, new UnleashReplacementEffect());
  this.addEffect(new UnleashRestrictionEffect());
}

public SpawnOfRixMaadi(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{3}{B}{R}");
  this.subtype.add(SubType.HORROR);
  this.power = new MageInt(5);
  this.toughness = new MageInt(3);
  // Unleash (You may have this creature enter the battlefield with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it.)
  this.addAbility(new UnleashAbility());
}

public DeadReveler(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{2}{B}");
  this.subtype.add(SubType.ZOMBIE);
  this.power = new MageInt(2);
  this.toughness = new MageInt(3);
  // Unleash (You may have this creature enter the battlefield with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it.)
  this.addAbility(new UnleashAbility());
}

public RakdosCackler(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{B/R}");
  this.subtype.add(SubType.DEVIL);
  this.power = new MageInt(1);
  this.toughness = new MageInt(1);
  // Unleash (You may have this creature enter the battlefield with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it.)
  this.addAbility(new UnleashAbility());
}

public GoreHouseChainwalker(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{1}{R}");
  this.subtype.add(SubType.HUMAN);
  this.subtype.add(SubType.WARRIOR);
  this.power = new MageInt(2);
  this.toughness = new MageInt(1);
  // Unleash (You may have this creature enter the battlefield with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it.)
  this.addAbility(new UnleashAbility());
  
}

public RakdosDrake (UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{2}{B}");
  this.subtype.add(SubType.DRAKE);
  this.power = new MageInt(1);
  this.toughness = new MageInt(2);
  // Flying
  this.addAbility(FlyingAbility.getInstance());
  // Unleash
  this.addAbility(new UnleashAbility());
}

public BloodfrayGiant(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{2}{R}{R}");
  this.subtype.add(SubType.GIANT);
  this.power = new MageInt(4);
  this.toughness = new MageInt(3);
  // Deathtouch
  this.addAbility(TrampleAbility.getInstance());
  // Unleash (You may have this creature enter the battlefield with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it.)
  this.addAbility(new UnleashAbility());
  
}

public SplatterThug(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{2}{R}");
  this.subtype.add(SubType.HUMAN);
  this.subtype.add(SubType.WARRIOR);
  this.power = new MageInt(2);
  this.toughness = new MageInt(2);
  // First strike
  this.addAbility(FirstStrikeAbility.getInstance());
  
  // Unleash (You may have this creature enter the battlefield with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it.)
  this.addAbility(new UnleashAbility());
  
}

public ThrillKillAssassin(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{1}{B}");
  this.subtype.add(SubType.HUMAN);
  this.subtype.add(SubType.ASSASSIN);
  this.power = new MageInt(1);
  this.toughness = new MageInt(2);
  // Deathtouch
  this.addAbility(DeathtouchAbility.getInstance());
  // Unleash (You may have this creature enter the battlefield with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it.)
  this.addAbility(new UnleashAbility());
  
}

public CarnivalHellsteed(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{4}{B}{R}");
  this.subtype.add(SubType.NIGHTMARE);
  this.subtype.add(SubType.HORSE);
  this.power = new MageInt(5);
  this.toughness = new MageInt(4);
  // First strike
  this.addAbility(FirstStrikeAbility.getInstance());
  // Haste
  this.addAbility(HasteAbility.getInstance());
  
  // Unleash (You may have this creature enter the battlefield with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it.)
  this.addAbility(new UnleashAbility());
  
}

public GrimRoustabout(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{1}{B}");
  this.subtype.add(SubType.SKELETON);
  this.subtype.add(SubType.WARRIOR);
  this.power = new MageInt(1);
  this.toughness = new MageInt(1);
  // Unleash (You may have this creature enter the battlefield with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it.)
  this.addAbility(new UnleashAbility());
  
  // {1}{B}: Regenerate Grim Roustabout.
  this.addAbility(new SimpleActivatedAbility(Zone.BATTLEFIELD, new RegenerateSourceEffect(), new ManaCostsImpl("{1}{B}")));
}

public ExavaRakdosBloodWitch(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{2}{B}{R}");
  addSuperType(SuperType.LEGENDARY);
  this.subtype.add(SubType.HUMAN);
  this.subtype.add(SubType.CLERIC);
  this.power = new MageInt(3);
  this.toughness = new MageInt(3);
  // First strike
  this.addAbility(FirstStrikeAbility.getInstance());
  // Haste
  this.addAbility(HasteAbility.getInstance());
  // Unleash
  this.addAbility(new UnleashAbility());
  // Each other creature you control with a +1/+1 counter on it has haste.
  this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, new GainAbilityAllEffect(HasteAbility.getInstance(), Duration.WhileOnBattlefield, filter, rule)));
}

public ChaosImps(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{4}{R}{R}");
  this.subtype.add(SubType.IMP);
  this.power = new MageInt(6);
  this.toughness = new MageInt(5);
  // Flying
  this.addAbility(FlyingAbility.getInstance());
  // Unleash (You may have this creature enter the battlefield with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it.)
  this.addAbility(new UnleashAbility());
  
  // Chaos Imps has trample as long as it has a +1/+1 counter on it.
  this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, 
      new ConditionalContinuousEffect(new GainAbilitySourceEffect(TrampleAbility.getInstance()), 
      new SourceHasCounterCondition(CounterType.P1P1),"{this} has trample as long as it has a +1/+1 counter on it")));
  
}

public HellholeFlailer(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{1}{B}{R}");
  this.subtype.add(SubType.OGRE);
  this.subtype.add(SubType.WARRIOR);
  this.power = new MageInt(3);
  this.toughness = new MageInt(2);
  // Unleash (You may have this creature enter the battlefield with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it.)
  this.addAbility(new UnleashAbility());
  // {2}{B}{R}, Sacrifice Hellhole Flailer: Hellhole Flailer deals damage equal to its power to target player.
  Ability ability = new SimpleActivatedAbility(Zone.BATTLEFIELD, new DamageTargetEffect(new SourcePermanentPowerCount()), new ManaCostsImpl("{2}{B}{R}"));
  ability.addTarget(new TargetPlayerOrPlaneswalker());
  ability.addCost(new SacrificeSourceCost());
  this.addAbility(ability);
}