How to use

ForestwalkAbility

in

mage.abilities.keyword

  @Override
  public ForestwalkAbility copy() {
    return new ForestwalkAbility(this);
  }
}

public HiddenPath(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.ENCHANTMENT},"{2}{G}{G}{G}{G}");
  // Green creatures have forestwalk.
  this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD,
      new GainAbilityAllEffect(new ForestwalkAbility(false), Duration.WhileOnBattlefield, filter)));
}

public NaturesCloak(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.SORCERY},"{2}{G}");
  // Green creatures you control gain forestwalk until end of turn.
  this.getSpellAbility().addEffect(new GainAbilityControlledEffect(
      new ForestwalkAbility(false), Duration.EndOfTurn, filter));
}

public OrbweaverKumo(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{4}{G}{G}");
  this.subtype.add(SubType.SPIRIT);
  this.power = new MageInt(3);
  this.toughness = new MageInt(4);
  this.addAbility(ReachAbility.getInstance());
  this.addAbility(new SpellCastControllerTriggeredAbility(new GainAbilitySourceEffect(new ForestwalkAbility(), Duration.EndOfTurn), StaticFilters.SPIRIT_OR_ARCANE_CARD, false));
}

public UnseenWalker(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{1}{G}");
  this.subtype.add(SubType.DRYAD);
  this.power = new MageInt(1);
  this.toughness = new MageInt(1);
  // Forestwalk
  this.addAbility(new ForestwalkAbility());
     // {1}{G}{G}: Target creature gains forestwalk until end of turn.
  Ability ability = new SimpleActivatedAbility(Zone.BATTLEFIELD, 
      new GainAbilityTargetEffect(new ForestwalkAbility(false), Duration.EndOfTurn), 
      new ManaCostsImpl("{1}{G}{G}"));
  ability.addTarget(new TargetCreaturePermanent());
  this.addAbility(ability);
}

public LumberingSatyr(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{2}{G}{G}");
  this.subtype.add(SubType.SATYR);
  this.subtype.add(SubType.BEAST);
  this.power = new MageInt(5);
  this.toughness = new MageInt(4);
  // All creatures have forestwalk.
  this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, 
      new GainAbilityAllEffect(new ForestwalkAbility(), Duration.WhileOnBattlefield, new FilterCreaturePermanent())));
}

public WeatherseedElf(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{G}");
  this.subtype.add(SubType.ELF);
  this.power = new MageInt(1);
  this.toughness = new MageInt(1);
  // {tap}: Target creature gains forestwalk until end of turn.
  Ability ability = new SimpleActivatedAbility(Zone.BATTLEFIELD,
      new GainAbilityTargetEffect(new ForestwalkAbility(false), Duration.EndOfTurn),
      new TapSourceCost());
  ability.addTarget(new TargetCreaturePermanent());
  this.addAbility(ability);
}

public ElvishChampion(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{1}{G}{G}");
  this.subtype.add(SubType.ELF);
  this.power = new MageInt(2);
  this.toughness = new MageInt(2);
  // Other Elf creatures get +1/+1 and have forestwalk. (They can't be blocked as long as defending player controls a Forest.)
  this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, new BoostAllEffect(1, 1, Duration.WhileOnBattlefield, filter, true)));
  this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, new GainAbilityAllEffect(new ForestwalkAbility(), Duration.WhileOnBattlefield, filter, true)));
}

public EmeraldOryx(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{3}{G}");
  this.subtype.add(SubType.ANTELOPE);
  this.power = new MageInt(2);
this.toughness = new MageInt(3);
  this.addAbility(new ForestwalkAbility());
}

public LeafDancer(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{1}{G}{G}");
  this.subtype.add(SubType.CENTAUR);
  this.power = new MageInt(2);
  this.toughness = new MageInt(2);
  // Forestwalk
  this.addAbility(new ForestwalkAbility());
}

public SomberwaldDryad(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{1}{G}");
  this.subtype.add(SubType.DRYAD);
  this.power = new MageInt(2);
  this.toughness = new MageInt(2);
  this.addAbility(new ForestwalkAbility());
}

public SlinkingSerpent(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{2}{U}{B}");
  this.subtype.add(SubType.SERPENT);
  this.power = new MageInt(2);
  this.toughness = new MageInt(3);
  this.addAbility(new ForestwalkAbility());
}

public ElvishPathcutter(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{3}{G}");
  this.subtype.add(SubType.ELF);
  this.subtype.add(SubType.SCOUT);
  this.power = new MageInt(1);
  this.toughness = new MageInt(2);
  // {2}{G}: Target Elf creature gains forestwalk until end of turn.
  Ability ability = new SimpleActivatedAbility(Zone.BATTLEFIELD, new GainAbilityTargetEffect(new ForestwalkAbility(), Duration.EndOfTurn), new ManaCostsImpl("{2}{G}"));
  ability.addTarget(new TargetCreaturePermanent(filter));
  this.addAbility(ability);
}

public RushwoodDryad(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{1}{G}");
  this.subtype.add(SubType.DRYAD);
  this.power = new MageInt(2);
  this.toughness = new MageInt(1);
  this.addAbility(new ForestwalkAbility());
}

public ZodiacRabbit(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{G}");
  this.subtype.add(SubType.RABBIT);
  this.power = new MageInt(1);
  this.toughness = new MageInt(1);
  // Forestwalk
  this.addAbility(new ForestwalkAbility());
}

public ZodiacTiger(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{2}{G}{G}");
  this.subtype.add(SubType.CAT);
  this.power = new MageInt(3);
  this.toughness = new MageInt(4);
  // Forestwalk
  this.addAbility(new ForestwalkAbility());
}

public ZendikarFarguide(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{4}{G}");
  this.subtype.add(SubType.ELEMENTAL);
  this.power = new MageInt(3);
  this.toughness = new MageInt(3);
  this.addAbility(new ForestwalkAbility());
}

public WillowDryad(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{G}");
  this.subtype.add(SubType.DRYAD);
  this.power = new MageInt(1);
  this.toughness = new MageInt(1);
  // Forestwalk
  this.addAbility(new ForestwalkAbility());
}

public HeartwoodTreefolk(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{2}{G}{G}");
  this.subtype.add(SubType.TREEFOLK);
  this.power = new MageInt(3);
  this.toughness = new MageInt(4);
  this.addAbility(new ForestwalkAbility());
}

public ZodiacMonkey(UUID ownerId, CardSetInfo setInfo) {
  super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{1}{G}");
  this.subtype.add(SubType.MONKEY);
  this.power = new MageInt(2);
  this.toughness = new MageInt(1);
  this.addAbility(new ForestwalkAbility());
}