// Deathtouch
this.addAbility(DeathtouchAbility.getInstance());
// <em>Ferocious</em> - Whenever Heir of the Wilds attacks, if you control a creature with power 4 or greater, Heir of the Wilds gets +1/+1 until end of turn.
Ability ability = new ConditionalTriggeredAbility(
new AttacksTriggeredAbility(new BoostSourceEffect(1,1,Duration.EndOfTurn), false),
FerociousCondition.getInstance(),
"<i>Ferocious</i> - Whenever {this} attacks, if you control a creature with power 4 or greater, {this} gets +1/+1 until end of turn."
);
this.addAbility(ability);