BlindObedience.java example

Explorer
mage-master
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package mage.cards.b;

import mage.abilities.Ability;
import mage.abilities.common.SimpleStaticAbility;
import mage.abilities.effects.ReplacementEffectImpl;
import mage.abilities.keyword.ExtortAbility;
import mage.cards.CardImpl;
import mage.cards.CardSetInfo;
import mage.constants.CardType;
import mage.constants.Duration;
import mage.constants.Outcome;
import mage.constants.Zone;
import mage.game.Game;
import mage.game.events.EntersTheBattlefieldEvent;
import mage.game.events.GameEvent;
import mage.game.permanent.Permanent;

import java.util.UUID;

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

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

        // Extort (Whenever you cast a spell, you may pay {WB}. If you do, each opponent loses 1 life and you gain that much life.)
        this.addAbility(new ExtortAbility());

        // Artifacts and creatures your opponents control enter the battlefield tapped.
        this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, new BlindObedienceTapEffect()));

    }

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

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

class BlindObedienceTapEffect extends ReplacementEffectImpl {

    BlindObedienceTapEffect() {
        super(Duration.WhileOnBattlefield, Outcome.Tap);
        staticText = "Artifacts and creatures your opponents control enter the battlefield tapped";
    }

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

    @Override
    public boolean replaceEvent(GameEvent event, Ability source, Game game) {
        Permanent target = ((EntersTheBattlefieldEvent) event).getTarget();
        if (target != null) {
            target.setTapped(true);
        }
        return false;
    }

    @Override
    public boolean checksEventType(GameEvent event, Game game) {
        return event.getType() == GameEvent.EventType.ENTERS_THE_BATTLEFIELD;
    }

    @Override
    public boolean applies(GameEvent event, Ability source, Game game) {
        if (game.getOpponents(source.getControllerId()).contains(event.getPlayerId())) {
            Permanent permanent = ((EntersTheBattlefieldEvent) event).getTarget();
            if (permanent != null && (permanent.isCreature() || permanent.isArtifact())) {
                return true;
            }
        }
        return false;
    }

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