Duneblast.java example

Explorer
mage-master
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package mage.cards.d;

import mage.abilities.Ability;
import mage.abilities.effects.OneShotEffect;
import mage.cards.CardImpl;
import mage.cards.CardSetInfo;
import mage.constants.CardType;
import mage.constants.Outcome;
import mage.filter.common.FilterCreaturePermanent;
import mage.game.Game;
import mage.game.permanent.Permanent;
import mage.players.Player;
import mage.target.Target;
import mage.target.common.TargetCreaturePermanent;

import java.util.Objects;
import java.util.UUID;

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

    public Duneblast(UUID ownerId, CardSetInfo setInfo) {
        super(ownerId,setInfo,new CardType[]{CardType.SORCERY},"{4}{W}{B}{G}");


        // Choose up to one creature. Destroy the rest.
        this.getSpellAbility().addEffect(new DuneblastEffect());

    }

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

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

class DuneblastEffect extends OneShotEffect {

    public DuneblastEffect() {
        super(Outcome.DestroyPermanent);
        this.staticText = "Choose up to one creature. Destroy the rest";
    }

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

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

    @Override
    public boolean apply(Game game, Ability source) {
        Player controller = game.getPlayer(source.getControllerId());
        if (controller != null) {
            Target target = new TargetCreaturePermanent(0,1,new FilterCreaturePermanent("creature to keep"), true);
            target.setRequired(true);
            Permanent creatureToKeep = null;
            if (controller.choose(outcome, target, source.getSourceId(), game)) {
                creatureToKeep = game.getPermanent(target.getFirstTarget());
            }
            for(Permanent creature: game.getBattlefield().getActivePermanents(new FilterCreaturePermanent(), source.getControllerId(), source.getSourceId(), game)) {
                if (!Objects.equals(creature, creatureToKeep)) {
                    creature.destroy(source.getSourceId(), game, false);
                }
            }
            return true;
        }
        return false;
    }
}