// First strike
this.addAbility(FirstStrikeAbility.getInstance());
// At the beginning of your upkeep, if your opponents control no creatures, Kezzerdrix deals 4 damage to you.
ConditionalTriggeredAbility ability = new ConditionalTriggeredAbility(new BeginningOfUpkeepTriggeredAbility(Zone.BATTLEFIELD, new DamageControllerEffect(4), TargetController.YOU, false), NoCreatureOpponentCondition.getInstance(), "At the beginning of your upkeep, if your opponents control no creatures, {this} deals 4 damage to you.");
this.addAbility(ability);
}