How to use

concatBy

method

in

mage.abilities.effects.common.continuous.LoseAbilityAttachedEffect

public SkyTether(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.ENCHANTMENT}, "{W}");
  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);
  // Enchanted creature has defender and loses flying.
  ability = new SimpleStaticAbility(new GainAbilityAttachedEffect(
      DefenderAbility.getInstance(), AttachmentType.AURA, Duration.WhileOnBattlefield
  ));
  ability.addEffect(new LoseAbilityAttachedEffect(
      FlyingAbility.getInstance(), AttachmentType.AURA
  ).concatBy("and"));
  this.addAbility(ability);
}