ObeliskOfUrd.java example

Explorer
mage-master
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package mage.cards.o;

import java.util.UUID;
import mage.abilities.Ability;
import mage.abilities.common.AsEntersBattlefieldAbility;
import mage.abilities.common.SimpleStaticAbility;
import mage.abilities.effects.ContinuousEffectImpl;
import mage.abilities.effects.common.ChooseCreatureTypeEffect;
import mage.abilities.keyword.ConvokeAbility;
import mage.cards.CardImpl;
import mage.cards.CardSetInfo;
import mage.constants.CardType;
import mage.constants.Duration;
import mage.constants.Layer;
import mage.constants.Outcome;
import mage.constants.SubLayer;
import mage.constants.Zone;
import mage.filter.common.FilterCreaturePermanent;
import mage.game.Game;
import mage.game.permanent.Permanent;

/**
 *
 * @author emerald000
 */
public class ObeliskOfUrd extends CardImpl {

    public ObeliskOfUrd(UUID ownerId, CardSetInfo setInfo) {
        super(ownerId,setInfo,new CardType[]{CardType.ARTIFACT},"{6}");

        // Convoke
        this.addAbility(new ConvokeAbility());

        // As Obelisk of Urd enters the battlefield, choose a creature type.
        this.addAbility(new AsEntersBattlefieldAbility(new ChooseCreatureTypeEffect(Outcome.BoostCreature)));

        // Creatures you control of the chosen type get +2/+2.
        this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, new ObeliskOfUrdBoostEffect()));
    }

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

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

class ObeliskOfUrdBoostEffect extends ContinuousEffectImpl {

    private static final FilterCreaturePermanent filter = new FilterCreaturePermanent();

    ObeliskOfUrdBoostEffect() {
        super(Duration.WhileOnBattlefield, Layer.PTChangingEffects_7, SubLayer.ModifyPT_7c, Outcome.BoostCreature);
        staticText = "Creatures you control of the chosen type get +2/+2.";
    }

    ObeliskOfUrdBoostEffect(final ObeliskOfUrdBoostEffect effect) {
        super(effect);
    }

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

    @Override
    public boolean apply(Game game, Ability source) {
        Permanent permanent = game.getPermanent(source.getSourceId());
        if (permanent != null) {
            String subtype = (String) game.getState().getValue(permanent.getId() + "_type");
            if (subtype != null) {
                for (Permanent perm : game.getBattlefield().getAllActivePermanents(filter, source.getControllerId(), game)) {
                    if (perm.hasSubtype(subtype, game)) {
                        perm.addPower(2);
                        perm.addToughness(2);
                    }
                }
            }
        }
        return true;
    }
}