How to use

DamageWithPowerTargetEffect

in

mage.abilities.effects.common

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

public ThrashThreat(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.INSTANT}, new CardType[]{CardType.SORCERY}, "{R/G}{R/G}", "{2}{R}{G}", SpellAbilityType.SPLIT);
  // Thrash
  // Target creature you control deals damage equal to its power to target creature or planeswalker you don't control.
  this.getLeftHalfCard().getSpellAbility().addEffect(
      new DamageWithPowerTargetEffect()
          .setText("Target creature you control deals damage equal to its power " +
              "to target creature or planeswalker you don't control.")
  );
  this.getLeftHalfCard().getSpellAbility().addTarget(new TargetControlledCreaturePermanent());
  this.getLeftHalfCard().getSpellAbility().addTarget(new TargetPermanent(filter));
  // Threat
  // Create a 4/4 red and green Beast creature token with trample.
  this.getRightHalfCard().getSpellAbility().addEffect(new CreateTokenEffect(new RedGreenBeastToken()));
}

@Override
public boolean apply(Game game, Ability source) {
  Player controller = game.getPlayer(source.getControllerId());
  Permanent controlledCreature = game.getPermanentOrLKIBattlefield(getTargetPointer().getFirst(game, source));
  Permanent targetCreature = game.getPermanent(source.getTargets().get(1).getFirstTarget());
  if (controller != null) {
    if (targetCreature != null && controlledCreature != null) {
      targetCreature.damage(controlledCreature.getPower().getValue(), controlledCreature.getId(), game, false, true);
    }
    return true;
  }
  return false;
}

public Brawl(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.INSTANT}, "{3}{R}{R}");
  // Until end of turn, all creatures gain "{T}: This creature deals damage equal to its power to target creature."
  Ability ability = new SimpleActivatedAbility(new DamageWithPowerTargetEffect(), new TapSourceCost());
  ability.addTarget(new TargetCreaturePermanent());
  this.getSpellAbility().addEffect(
      new GainAbilityAllEffect(ability, Duration.EndOfTurn, new FilterCreaturePermanent())
          .setText("Until end of turn, all creatures gain \"{T}: This creature deals damage equal to its power to target creature.\"")
  );
}

public AggressiveInstinct(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.SORCERY}, "{1}{G}");
  // Target creature you control deals damage equal to its power to target creature you don't control.
  this.getSpellAbility().addEffect(new DamageWithPowerTargetEffect());
  this.getSpellAbility().addTarget(new TargetControlledCreaturePermanent());
  this.getSpellAbility().addTarget(new TargetCreaturePermanent(filter));
}

public TailSlash(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.INSTANT}, "{2}{R}");
  // Target creature you control deals damage equal to its power to target creature you don't control.
  this.getSpellAbility().addTarget(new TargetControlledCreaturePermanent());
  this.getSpellAbility().addTarget(new TargetCreaturePermanent(filter));
  this.getSpellAbility().addEffect(new DamageWithPowerTargetEffect());
}

public RabidBite(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.SORCERY}, "{1}{G}");
  // Target creature you control deals damage equal to its power to target creature you don't control.
  this.getSpellAbility().addTarget(new TargetControlledCreaturePermanent());
  this.getSpellAbility().addTarget(new TargetCreaturePermanent(filter));
  this.getSpellAbility().addEffect(new DamageWithPowerTargetEffect());
}

public Ambuscade(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.INSTANT}, "{2}{G}");
  // Target creature you control gets +1/+0 until end of turn.
  Effect effect = new BoostTargetEffect(1, 0, Duration.EndOfTurn);
  this.getSpellAbility().addTarget(new TargetControlledCreaturePermanent());
  this.getSpellAbility().addEffect(effect);
  // It deals damage equal to its power to target creature you don't control.
  effect = new DamageWithPowerTargetEffect();
  effect.setText("It deals damage equal to its power to target creature you don't control");
  this.getSpellAbility().addTarget(new TargetCreaturePermanent(filter));
  this.getSpellAbility().addEffect(effect);
}

public ClearShot(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.INSTANT}, "{2}{G}");
  // Target creature you control gets +1/+1 until end of turn.
  Effect effect = new BoostTargetEffect(1, 1, Duration.EndOfTurn);
  this.getSpellAbility().addTarget(new TargetControlledCreaturePermanent());
  this.getSpellAbility().addEffect(effect);
  // It deals damage equal to its power to target creature you don't control.
  effect = new DamageWithPowerTargetEffect();
  effect.setText("It deals damage equal to its power to target creature you don't control");
  this.getSpellAbility().addTarget(new TargetCreaturePermanent(filter));
  this.getSpellAbility().addEffect(effect);
}

public HuatliDinosaurKnight(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.PLANESWALKER}, "{4}{R}{W}");
  addSuperType(SuperType.LEGENDARY);
  this.subtype.add(SubType.HUATLI);
  this.addAbility(new PlaneswalkerEntersWithLoyaltyCountersAbility(4));
  // +2: Put two +1/+1 counters on up to one target Dinosaur you control.
  Ability ability = new LoyaltyAbility(new AddCountersTargetEffect(CounterType.P1P1.createInstance(2))
      .setText("Put two +1/+1 counters on up to one target Dinosaur you control."), 2
  );
  ability.addTarget(new TargetCreaturePermanent(0, 1, filter, false));
  this.addAbility(ability);
  // -3: Target Dinosaur you control deals damage equal to its power to target creature you don't control.
  ability = new LoyaltyAbility(new DamageWithPowerTargetEffect(), -3);
  ability.addTarget(new TargetCreaturePermanent(filter));
  ability.addTarget(new TargetCreaturePermanent(filter2));
  this.addAbility(ability);
  // -7: Dinosaurs you control get +4/+4 until end of turn.
  this.addAbility(new LoyaltyAbility(new BoostControlledEffect(4, 4, Duration.EndOfTurn, filter3), -7));
}

public VivienOfTheArkbow(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.PLANESWALKER}, "{4}{G}{G}");
  this.addSuperType(SuperType.LEGENDARY);
  this.subtype.add(SubType.VIVIEN);
  this.addAbility(new PlaneswalkerEntersWithLoyaltyCountersAbility(5));
  // +2: Put two +1/+1 counters on up to one target creature.
  Ability ability = new LoyaltyAbility(new AddCountersTargetEffect(CounterType.P1P1.createInstance(2)), 2);
  ability.addTarget(new TargetCreaturePermanent(0, 1));
  this.addAbility(ability);
  // −3: Target creature you control deals damage equal to its power to target creature you don't control.
  ability = new LoyaltyAbility(new DamageWithPowerTargetEffect(), -3);
  ability.addTarget(new TargetControlledCreaturePermanent());
  ability.addTarget(new TargetCreaturePermanent(filter));
  this.addAbility(ability);
  // −9: Creatures you control get +4/+4 and gain trample until end of turn.
  ability = new LoyaltyAbility(
      new BoostControlledEffect(4, 4, Duration.EndOfTurn)
          .setText("Creatures you control get +4/+4"), -9
  );
  ability.addEffect(new GainAbilityControlledEffect(
      TrampleAbility.getInstance(),
      Duration.EndOfTurn,
      StaticFilters.FILTER_PERMANENT_CREATURES
  ).setText("and gain trample until end of turn"));
  this.addAbility(ability);
}

public NaturesWay(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.SORCERY}, "{1}{G}");
  // Target creature you control gains vigilance and trample until end of turn.
  Effect effect = new GainAbilityTargetEffect(VigilanceAbility.getInstance(), Duration.EndOfTurn);
  effect.setText("Target creature you control gains vigilance");
  this.getSpellAbility().addEffect(effect);
  effect = new GainAbilityTargetEffect(TrampleAbility.getInstance(), Duration.EndOfTurn);
  effect.setText("and trample until end of turn");
  this.getSpellAbility().addEffect(effect);
  this.getSpellAbility().addTarget(new TargetControlledCreaturePermanent());
  // It deals damage equal to its power to target creature you don't control.
  effect = new DamageWithPowerTargetEffect();
  effect.setText("It deals damage equal to its power to target creature you don't control");
  this.getSpellAbility().addTarget(new TargetCreaturePermanent(filter));
  this.getSpellAbility().addEffect(effect);
}