HowlpackWolf.java example

Explorer
mage-master
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package mage.cards.h;

import java.util.UUID;
import mage.MageInt;
import mage.abilities.Ability;
import mage.abilities.common.SimpleStaticAbility;
import mage.abilities.effects.RestrictionEffect;
import mage.cards.CardImpl;
import mage.cards.CardSetInfo;
import mage.constants.CardType;
import mage.constants.Duration;
import mage.constants.Zone;
import mage.filter.common.FilterControlledPermanent;
import mage.filter.predicate.Predicates;
import mage.filter.predicate.mageobject.SubtypePredicate;
import mage.filter.predicate.permanent.AnotherPredicate;
import mage.game.Game;
import mage.game.permanent.Permanent;

/**
 *
 * @author LevelX2
 */
public class HowlpackWolf extends CardImpl {

    public HowlpackWolf(UUID ownerId, CardSetInfo setInfo) {
        super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{2}{R}");
        this.subtype.add("Wolf");
        this.power = new MageInt(3);
        this.toughness = new MageInt(3);

        // Howlpack Wolf can't block unless you control another Wolf or Werewolf.
        this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, new HowlpackWolfRestrictionEffect()));
    }

    public HowlpackWolf(final HowlpackWolf card) {
        super(card);
    }

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

class HowlpackWolfRestrictionEffect extends RestrictionEffect {

    private static final FilterControlledPermanent filter = new FilterControlledPermanent("another Wolf or Werewolf");

    static {
        filter.add(Predicates.or(new SubtypePredicate("Wolf"), new SubtypePredicate("Werewolf")));
        filter.add(new AnotherPredicate());
    }

    public HowlpackWolfRestrictionEffect() {
        super(Duration.WhileOnBattlefield);

        staticText = "{this} can't block unless you control another Wolf or Werewolf";
    }

    public HowlpackWolfRestrictionEffect(final HowlpackWolfRestrictionEffect effect) {
        super(effect);
    }

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

    @Override
    public boolean canBlock(Permanent attacker, Permanent blocker, Ability source, Game game) {
        return false;
    }

    @Override
    public boolean applies(Permanent permanent, Ability source, Game game) {
        return permanent.getId().equals(source.getSourceId())
                && game.getBattlefield().count(filter, source.getSourceId(), source.getControllerId(), game) == 0;
    }
}