How to use

setText

method

in

mage.abilities.effects.common.FightTargetSourceEffect

private static Effect getEffectToAdd() {
  Ability abilityToAdd = new EntersBattlefieldTriggeredAbility(new FightTargetSourceEffect().setText("you may have it fight another target creature"), true);
  abilityToAdd.addTarget(new TargetCreaturePermanent(filter));
  Effect effect = new GainAbilityTargetEffect(abilityToAdd, Duration.EndOfTurn,
      "it gains \"When this creature enters the battlefield, you may have it fight another target creature.\"", true);
  return effect;
}

public AffectionateIndrik(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{5}{G}");
  this.subtype.add(SubType.BEAST);
  this.power = new MageInt(4);
  this.toughness = new MageInt(4);
  // When Affectionate Indrik enters the battlefield, you may have it fight target creature you don't control.
  Ability ability = new EntersBattlefieldTriggeredAbility(
      new FightTargetSourceEffect()
          .setText("you may have it fight "
              + "target creature you don't control"),
      true
  );
  ability.addTarget(new TargetCreaturePermanent(filter));
  this.addAbility(ability);
}

public RavagerWurm(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{3}{R}{G}{G}");
  this.subtype.add(SubType.WURM);
  this.power = new MageInt(4);
  this.toughness = new MageInt(5);
  // Riot
  this.addAbility(new RiotAbility());
  // When Ravager Wurm enters the battlefield, choose up to one —
  // • Ravager Wurm fights target creature you don't control.
  Ability ability = new EntersBattlefieldTriggeredAbility(
      new FightTargetSourceEffect().setText("{this} fights target creature you don't control"), false
  );
  ability.addTarget(new TargetPermanent(filter));
  ability.getModes().setMinModes(0);
  ability.getModes().setMaxModes(1);
  // • Destroy target land with an activated ability that isn't a mana ability.
  Mode mode = new Mode(new DestroyTargetEffect());
  mode.addTarget(new TargetPermanent(filter2));
  ability.addMode(mode);
  this.addAbility(ability);
}