// Flying
this.addAbility(FlyingAbility.getInstance());
// Tribute 2
this.addAbility(new TributeAbility(2));
// When Ornitharch enters the battlefield, if tribute wasn't paid, put two 1/1 white Bird creature tokens with flying onto the battlefield.
TriggeredAbility ability = new EntersBattlefieldTriggeredAbility(new CreateTokenEffect(new BirdToken(), 2), false);
this.addAbility(new ConditionalTriggeredAbility(ability, TributeNotPaidCondition.getInstance(),
"When {this} enters the battlefield, if its tribute wasn't paid, put two 1/1 white Bird creature tokens with flying onto the battlefield."));
}