FoulEmissary.java example

Explorer
mage-master
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package mage.cards.f;

import mage.MageInt;
import mage.abilities.common.EntersBattlefieldTriggeredAbility;
import mage.abilities.common.SacrificeSourceTriggeredAbility;
import mage.abilities.dynamicvalue.common.StaticValue;
import mage.abilities.effects.Effect;
import mage.abilities.effects.common.CreateTokenEffect;
import mage.abilities.effects.common.LookLibraryAndPickControllerEffect;
import mage.abilities.keyword.EmergeAbility;
import mage.cards.CardImpl;
import mage.cards.CardSetInfo;
import mage.constants.CardType;
import mage.filter.FilterCard;
import mage.filter.predicate.mageobject.CardTypePredicate;
import mage.game.Game;
import mage.game.events.GameEvent;
import mage.game.permanent.token.EldraziHorrorToken;
import mage.game.stack.Spell;

import java.util.UUID;

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

    private static final FilterCard filter = new FilterCard("a creature card");

    static {
        filter.add(new CardTypePredicate(CardType.CREATURE));
    }

    public FoulEmissary(UUID ownerId, CardSetInfo setInfo) {
        super(ownerId,setInfo,new CardType[]{CardType.CREATURE},"{2}{G}");
        this.subtype.add("Human");
        this.subtype.add("Horror");
        this.power = new MageInt(1);
        this.toughness = new MageInt(1);

        // When Foul Emissary enters the battlefield, look at the top four cards of your library. You may reveal a creature card from among them and put it into your hand. Put the rest on the bottom of your library in any order.
        this.addAbility(new EntersBattlefieldTriggeredAbility(new LookLibraryAndPickControllerEffect(new StaticValue(4), false, new StaticValue(1), filter, false)));

        // When you sacrifice Foul Emissary while casting a spell with emerge, create a 3/2 colorless Eldrazi Horror creature token.
        this.addAbility(new FoulEmissaryTriggeredAbility(new CreateTokenEffect(new EldraziHorrorToken()), false));
    }

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

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

class FoulEmissaryTriggeredAbility extends SacrificeSourceTriggeredAbility {

    public FoulEmissaryTriggeredAbility(Effect effect, boolean optional) {
        super(effect, optional);
    }

    public FoulEmissaryTriggeredAbility(final FoulEmissaryTriggeredAbility ability) {
        super(ability);
    }

    @Override
    public boolean checkTrigger(GameEvent event, Game game) {
        if (super.checkTrigger(event, game)) {
            Spell spell = game.getStack().getSpell(event.getSourceId());
            return spell != null && spell.getSpellAbility() instanceof EmergeAbility;
        }
        return false;
    }

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

    @Override
    public String getRule() {
        return "When you sacrifice {this} while casting a spell with emerge, create a 3/2 colorless Eldrazi Horror creature token.";
    }
}