this.toughness = new MageInt(3);
// Whenever a Sliver deals combat damage to a player, its controller may put a 1/1 colorless Sliver creature token onto the battlefield.
Effect effect = new CreateTokenTargetEffect(new SliverToken());
effect.setText("its controller may put a 1/1 colorless Sliver creature token onto the battlefield");
this.addAbility(new DealsDamageToAPlayerAllTriggeredAbility(effect,
new FilterCreaturePermanent("Sliver", "a Sliver"),
true, true, true));
}