How to use

AttacksIfAbleSourceEffect

in

mage.abilities.effects.common.combat

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

public LegionWarbossAbility() {
  super(Zone.BATTLEFIELD, new AttacksIfAbleSourceEffect(
      Duration.WhileOnBattlefield, true
  ).setText("this creature attacks this combat if able"));
}

public AttacksEachCombatStaticAbility() {
  super(Zone.BATTLEFIELD, new AttacksIfAbleSourceEffect(Duration.WhileOnBattlefield, true));
}

public RelentlessRaptor(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{R}{W}");
  this.subtype.add(SubType.DINOSAUR);
  this.power = new MageInt(3);
  this.toughness = new MageInt(3);
  // Vigilance
  this.addAbility(VigilanceAbility.getInstance());
  // Relentless Raptor attacks or blocks each combat if able.
  Ability ability = new SimpleStaticAbility(Zone.BATTLEFIELD, new AttacksIfAbleSourceEffect(Duration.WhileOnBattlefield, true).setText("{this} attacks"));
  ability.addEffect(new BlocksIfAbleSourceEffect(Duration.WhileOnBattlefield).setText("or blocks each combat if able"));
  this.addAbility(ability);
}

public MaraudingMaulhorn(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{2}{R}{R}");
  this.subtype.add(SubType.BEAST);
  this.power = new MageInt(5);
  this.toughness = new MageInt(3);
  // Marauding Maulhorn attacks each combat if able unless you control a creature named Advocate of the Beast.
  Effect effect = new ConditionalRequirementEffect(
      new AttacksIfAbleSourceEffect(Duration.WhileOnBattlefield, true),
      new PermanentsOnTheBattlefieldCondition(filter, ComparisonType.FEWER_THAN, 1));
  effect.setText("{this} attacks each combat if able unless you control a creature named Advocate of the Beast");
  this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, effect));
}

public RecklessCohort(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{1}{R}");
  this.subtype.add(SubType.HUMAN);
  this.subtype.add(SubType.WARRIOR);
  this.subtype.add(SubType.ALLY);
  this.power = new MageInt(2);
  this.toughness = new MageInt(2);
  // Reckless Cohort attacks each combat if able unless you control another Ally.
  Effect effect = new ConditionalRequirementEffect(
      new AttacksIfAbleSourceEffect(Duration.WhileOnBattlefield, true),
      new PermanentsOnTheBattlefieldCondition(filter, ComparisonType.FEWER_THAN, 1));
  effect.setText("{this} attacks each combat if able unless you control another Ally");
  this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, effect));
}

public TerentatekCub(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{1}{R}");
  this.subtype.add(SubType.BEAST);
  this.power = new MageInt(2);
  this.toughness = new MageInt(2);
  // As long as an opponent controls a Jedi or Sith, {this} gets +1/+1 and attacks each turn if able 
  this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, new ConditionalContinuousEffect(
      new BoostSourceEffect(1, 1, Duration.Custom),
      new OpponentControlsPermanentCondition(filter),
      "As long as an opponent controls a Jedi or Sith, {this} gets +1/+1 ")
  ));
  this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, new ConditionalContinuousEffect(
      new AttacksIfAbleSourceEffect(Duration.Custom),
      new OpponentControlsPermanentCondition(filter),
      "and attacks each turn if able.")
  ));
}

public OtarianJuggernaut(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.ARTIFACT, CardType.CREATURE}, "{4}");
  this.subtype.add(SubType.JUGGERNAUT);
  this.power = new MageInt(2);
  this.toughness = new MageInt(3);
  // Otarian Juggernaut can't be blocked by Walls.
  this.addAbility(new SimpleEvasionAbility(new CantBeBlockedByCreaturesSourceEffect(filter, Duration.WhileOnBattlefield)));
  // Threshold - As long as seven or more cards are in your graveyard, Otarian Juggernaut gets +3/+0 and attacks each combat if able.
  Ability ability = new SimpleStaticAbility(Zone.BATTLEFIELD, new ConditionalContinuousEffect(
      new BoostSourceEffect(3, 0, Duration.WhileOnBattlefield),
      new CardsInControllerGraveCondition(7),
      "As long as seven or more cards are in your graveyard, {this} gets +3/+0"));
  Effect effect = new ConditionalContinuousEffect(
      new AttacksIfAbleSourceEffect(Duration.WhileOnBattlefield, true),
      new CardsInControllerGraveCondition(7),
      "and attacks each combat if able"
  );
  ability.addEffect(effect);
  ability.setAbilityWord(AbilityWord.THRESHOLD);
  this.addAbility(ability);
}

public Kookus(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{3}{R}{R}");
  this.subtype.add(SubType.DJINN);
  this.power = new MageInt(3);
  this.toughness = new MageInt(5);
  // Trample
  this.addAbility(TrampleAbility.getInstance());
  // At the beginning of your upkeep, if you don't control a creature named Keeper of Kookus, Kookus deals 3 damage to you and attacks this turn if able.
  TriggeredAbility ability = new BeginningOfUpkeepTriggeredAbility(new DamageControllerEffect(3), TargetController.YOU, false);
  ability.addEffect(new AttacksIfAbleSourceEffect(Duration.EndOfTurn));
  this.addAbility(new ConditionalInterveningIfTriggeredAbility(
      ability,
      new InvertCondition(new PermanentsOnTheBattlefieldCondition(filter)),
      "At the beginning of your upkeep, "
      + "if you don't control a creature named Keeper of Kookus, "
      + "{this} deals 3 damage to you and attacks this turn if able"
  ));
  // {R}: Kookus gets +1/+0 until end of turn.
  this.addAbility(new SimpleActivatedAbility(Zone.BATTLEFIELD, new BoostSourceEffect(1, 0, Duration.EndOfTurn), new ColoredManaCost(ColoredManaSymbol.R)));
}