this.power = new MageInt(5);
this.toughness = new MageInt(3);
// Marauding Maulhorn attacks each combat if able unless you control a creature named Advocate of the Beast.
Effect effect = new ConditionalRequirementEffect(
new AttacksIfAbleSourceEffect(Duration.WhileOnBattlefield),
new PermanentsOnTheBattlefieldCondition(filter, PermanentsOnTheBattlefieldCondition.CountType.FEWER_THAN, 1));
effect.setText("{this} attacks each combat if able unless you control a creature named Advocate of the Beast");
this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, effect));