How to use

SacrificeAttachedCost

in

mage.abilities.costs.common

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

public BetrothedOfFire(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.ENCHANTMENT}, "{1}{R}");
  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);
  // Sacrifice an untapped creature: Enchanted creature gets +2/+0 until end of turn.
  this.addAbility(new SimpleActivatedAbility(
      new BoostEnchantedEffect(2, 0, Duration.EndOfTurn),
      new SacrificeTargetCost(new TargetControlledPermanent(filter))
  ));
  // Sacrifice enchanted creature: Creatures you control get +2/+0 until end of turn.
  this.addAbility(new SimpleActivatedAbility(
      new BoostControlledEffect(2, 0, Duration.EndOfTurn),
      new SacrificeAttachedCost()
  ));
}

public CurseArtifact(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.ENCHANTMENT},"{2}{B}{B}");
  this.subtype.add(SubType.AURA);
  // Enchant artifact
  TargetPermanent auraTarget = new TargetArtifactPermanent();
  this.getSpellAbility().addTarget(auraTarget);
  this.getSpellAbility().addEffect(new AttachEffect(Outcome.Detriment));
  this.addAbility(new EnchantAbility(auraTarget.getTargetName()));
  // At the beginning of the upkeep of enchanted artifact's controller, Curse Artifact deals 2 damage to that player unless he or she sacrifices that artifact.
  Cost cost = new SacrificeAttachedCost();
  cost.setText("sacrifice attached artifact");
  Effect effect = new DoUnlessTargetPlayerOrTargetsControllerPaysEffect(new DamageTargetEffect(2), cost, "Sacrifice enchanted artifact? (otherwise {this} deals 2 damage to you)");
  effect.setText("{this} deals 2 damage to that player unless he or she sacrifices that artifact");
  this.addAbility(new BeginningOfUpkeepTriggeredAbility(Zone.BATTLEFIELD, effect, TargetController.CONTROLLER_ATTACHED_TO, false, true, "At the beginning of the upkeep of enchanted artifact's controller, "));
}

public BloodfireInfusion(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.ENCHANTMENT}, "{2}{R}");
  this.subtype.add(SubType.AURA);
  // Enchant creature you control
  TargetPermanent auraTarget = new TargetControlledCreaturePermanent();
  this.getSpellAbility().addTarget(auraTarget);
  this.getSpellAbility().addEffect(new AttachEffect(Outcome.BoostCreature));
  Ability ability = new EnchantAbility(auraTarget.getTargetName());
  this.addAbility(ability);
  // {R}, Sacrifice enchanted creature: Bloodfire Infusion deals damage equal to the sacrificed creature's power to each creature.
  Effect effect = new DamageAllEffect(new AttachedPermanentPowerCount(), new FilterCreaturePermanent());
  effect.setText("{this} deals damage equal to the sacrificed creature's power to each creature");
  Ability ability2 = new SimpleActivatedAbility(Zone.BATTLEFIELD, effect, new ManaCostsImpl("{R}"));
  ability2.addCost(new SacrificeAttachedCost());
  this.addAbility(ability2);
}