How to use

DealsDamageToACreatureAttachedTriggeredAbility

in

mage.abilities.common

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

@Override
public boolean checkTrigger(GameEvent event, Game game) {
  if (!combatOnly || ((DamagedCreatureEvent) event).isCombatDamage()) {
    Permanent attachment = game.getPermanent(this.getSourceId());
    if (attachment != null
        && attachment.isAttachedTo(event.getSourceId())) {
      if (setTargetPointer) {
        for (Effect effect : this.getEffects()) {
          effect.setTargetPointer(new FixedTarget(event.getTargetId()));
          effect.setValue("damage", event.getAmount());
        }
      }
      return true;
    }
  }
  return false;
}

public VenomousFangs(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.ENCHANTMENT}, "{2}{G}");
  
  this.subtype.add(SubType.AURA);
  // Enchant creature
  TargetPermanent auraTarget = new TargetCreaturePermanent();
  this.getSpellAbility().addTarget(auraTarget);
  this.getSpellAbility().addEffect(new AttachEffect(Outcome.BoostCreature));
  Ability ability = new EnchantAbility(auraTarget.getTargetName());
  this.addAbility(ability);
  // Whenever enchanted creature deals damage to a creature, destroy the other creature.
  this.addAbility(new DealsDamageToACreatureAttachedTriggeredAbility(new DestroyTargetEffect(), false, "enchanted creature", false, true));
  
}

public Charisma(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.ENCHANTMENT}, "{U}{U}{U}");
  
  this.subtype.add(SubType.AURA);
  // Enchant creature
  TargetPermanent auraTarget = new TargetCreaturePermanent();
  this.getSpellAbility().addTarget(auraTarget);
  this.getSpellAbility().addEffect(new AttachEffect(Outcome.BoostCreature));
  Ability ability = new EnchantAbility(auraTarget.getTargetName());
  this.addAbility(ability);
  // Whenever enchanted creature deals damage to a creature, gain control of the other creature for as long as Charisma remains on the battlefield.
  Condition condition = SourceOnBattlefieldCondition.instance;
  ConditionalContinuousEffect conditionalEffect = new ConditionalContinuousEffect(new GainControlTargetEffect(Duration.Custom), condition, rule);
  this.addAbility(new DealsDamageToACreatureAttachedTriggeredAbility(conditionalEffect, false, "enchanted creature", false, true));
  
}

public NekoTe(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.ARTIFACT},"{3}");
  this.subtype.add(SubType.EQUIPMENT);
  // Whenever equipped creature deals damage to a creature, tap that creature. That creature doesn't untap during its controller's untap step for as long as Neko-Te remains on the battlefield.
  ContinuousRuleModifyingEffect skipUntapEffect = new DontUntapInControllersUntapStepTargetEffect(Duration.WhileOnBattlefield);
  skipUntapEffect.setText("That creature doesn't untap during its controller's untap step for as long as {this} remains on the battlefield");
  ConditionalContinuousRuleModifyingEffect effect = new ConditionalContinuousRuleModifyingEffect(skipUntapEffect, SourceOnBattlefieldCondition.instance);
  Ability ability = new DealsDamageToACreatureAttachedTriggeredAbility(new TapTargetEffect("that creature"), false, "equipped creature", false, true);
  ability.addEffect(effect);
  this.addAbility(ability);
  // Whenever equipped creature deals damage to a player, that player loses 1 life.
  this.addAbility(new DealsDamageToAPlayerAttachedTriggeredAbility(new LoseLifeTargetEffect(1), "equipped creature", false, true, false));
  // Equip {2}
  this.addAbility(new EquipAbility(Outcome.Benefit, new GenericManaCost(2)));
}