this.expansionSetCode = "CMD";
this.color.setGreen(true);
// If you control a Forest, rather than pay Invigorate's mana cost, you may have an opponent gain 3 life.
this.addAbility(new AlternativeCostSourceAbility(new GainLifeOpponentCost(3), new PermanentsOnTheBattlefieldCondition(filter)));
// Target creature gets +4/+4 until end of turn.
this.getSpellAbility().addEffect(new BoostTargetEffect(4,4,Duration.EndOfTurn));
this.getSpellAbility().addTarget(new TargetCreaturePermanent());
}