// Other Merfolk creatures get +1/+1 and have islandwalk.
Effect effect = new BoostAllEffect(1, 1, Duration.WhileOnBattlefield, filter, true);
effect.setText("Other Merfolk creatures get +1/+1");
Ability ability = new SimpleStaticAbility(Zone.BATTLEFIELD, effect);
effect = new GainAbilityAllEffect(new IslandwalkAbility(), Duration.WhileOnBattlefield, filter, true);
effect.setText("and have islandwalk");
ability.addEffect(effect);
this.addAbility(ability);
}