How to use

ProtectionChosenColorSourceEffect

in

mage.abilities.effects.keyword

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

public VoiceOfAll(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.CREATURE}, "{2}{W}{W}");
  this.subtype.add(SubType.ANGEL);
  this.power = new MageInt(2);
  this.toughness = new MageInt(2);
  // Flying
  this.addAbility(FlyingAbility.getInstance());
  // As Voice of All enters the battlefield, choose a color.
  this.addAbility(new AsEntersBattlefieldAbility(new ChooseColorEffect(Outcome.Benefit)));
  // Voice of All has protection from the chosen color.
  this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, new ProtectionChosenColorSourceEffect()));
}

public OrderOfTheStars(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{W}");
  this.subtype.add(SubType.HUMAN);
  this.subtype.add(SubType.CLERIC);
  this.power = new MageInt(0);
  this.toughness = new MageInt(1);
  // Defender
  this.addAbility(DefenderAbility.getInstance());
  // As Order of the Stars enters the battlefield, choose a color.
  this.addAbility(new AsEntersBattlefieldAbility(new ChooseColorEffect(Outcome.Benefit)));
  // Order of the Stars has protection from the chosen color.
  this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, new ProtectionChosenColorSourceEffect()));
}