How to use

PreventDamageByColorEffect

in

mage.abilities.effects.common

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

public SphereOfTruth(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.ENCHANTMENT}, "{3}{W}");
  // If a white source would deal damage to you, prevent 2 of that damage.
  this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, new PreventDamageByColorEffect(ObjectColor.WHITE, 2)));
}

public SphereOfDuty(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.ENCHANTMENT}, "{3}{W}");
  // If a green source would deal damage to you, prevent 2 of that damage.
  this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, new PreventDamageByColorEffect(ObjectColor.GREEN, 2)));
}

public SphereOfGrace(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.ENCHANTMENT}, "{3}{W}");
  // If a black source would deal damage to you, prevent 2 of that damage.
  this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, new PreventDamageByColorEffect(ObjectColor.BLACK, 2)));
}

public SphereOfLaw(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.ENCHANTMENT}, "{3}{W}");
  // If a red source would deal damage to you, prevent 2 of that damage.
  this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, new PreventDamageByColorEffect(ObjectColor.RED, 2)));
}

public SphereOfReason(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId, setInfo, new CardType[]{CardType.ENCHANTMENT}, "{3}{W}");
  // If a blue source would deal damage to you, prevent 2 of that damage.
  this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, new PreventDamageByColorEffect(ObjectColor.BLUE, 2)));
}