GravePeril.java example

Explorer
mage-master
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package mage.cards.g;

import mage.ObjectColor;
import mage.abilities.Ability;
import mage.abilities.common.EntersBattlefieldAllTriggeredAbility;
import mage.abilities.effects.Effect;
import mage.abilities.effects.OneShotEffect;
import mage.abilities.effects.common.DestroyTargetEffect;
import mage.cards.CardImpl;
import mage.cards.CardSetInfo;
import mage.constants.CardType;
import mage.constants.Outcome;
import mage.constants.SetTargetPointer;
import mage.constants.Zone;
import mage.filter.common.FilterCreaturePermanent;
import mage.filter.predicate.Predicates;
import mage.filter.predicate.mageobject.ColorPredicate;
import mage.game.Game;
import mage.game.permanent.Permanent;

import java.util.UUID;

/**
 *
 * @author emerald000
 */
public class GravePeril extends CardImpl {
    
    private static final FilterCreaturePermanent filter = new FilterCreaturePermanent("a nonblack creature");
    static {
        filter.add(Predicates.not(new ColorPredicate(ObjectColor.BLACK)));
    }

    public GravePeril(UUID ownerId, CardSetInfo setInfo) {
        super(ownerId,setInfo,new CardType[]{CardType.ENCHANTMENT},"{1}{B}");

        // When a nonblack creature enters the battlefield, sacrifice Grave Peril. If you do, destroy that creature.
        this.addAbility(new EntersBattlefieldAllTriggeredAbility(Zone.BATTLEFIELD, new GravePerilEffect(), filter, false, SetTargetPointer.PERMANENT, null));
    }

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

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

class GravePerilEffect extends OneShotEffect {
    
    GravePerilEffect() {
        super(Outcome.DestroyPermanent);
        this.staticText = "sacrifice Grave Peril. If you do, destroy that creature";
    }
    
    GravePerilEffect(final GravePerilEffect effect) {
        super(effect);
    }
    
    @Override
    public GravePerilEffect copy() {
        return new GravePerilEffect(this);
    }
    
    @Override
    public boolean apply(Game game, Ability source) {
        Permanent permanent = (Permanent) source.getSourceObjectIfItStillExists(game);
        if (permanent != null) {
            if (permanent.sacrifice(source.getSourceId(), game)) {
                Effect effect = new DestroyTargetEffect();
                effect.setTargetPointer(this.getTargetPointer());
                return effect.apply(game, source);
            }
        }
        return false;
    }
}