SickeningShoal.java example

Explorer
mage-master
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package mage.cards.s;

import java.util.UUID;
import mage.ObjectColor;
import mage.abilities.costs.AlternativeCostSourceAbility;
import mage.abilities.costs.common.ExileFromHandCost;
import mage.abilities.dynamicvalue.DynamicValue;
import mage.abilities.dynamicvalue.common.ExileFromHandCostCardConvertedMana;
import mage.abilities.dynamicvalue.common.SignInversionDynamicValue;
import mage.abilities.effects.common.continuous.BoostTargetEffect;
import mage.cards.CardImpl;
import mage.cards.CardSetInfo;
import mage.constants.CardType;
import mage.constants.Duration;
import mage.filter.common.FilterOwnedCard;
import mage.filter.predicate.Predicates;
import mage.filter.predicate.mageobject.CardIdPredicate;
import mage.filter.predicate.mageobject.ColorPredicate;
import mage.target.common.TargetCardInHand;
import mage.target.common.TargetCreaturePermanent;

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

    public SickeningShoal(UUID ownerId, CardSetInfo setInfo) {
        super(ownerId,setInfo,new CardType[]{CardType.INSTANT},"{X}{B}{B}");
        this.subtype.add("Arcane");


        // You may exile a black card with converted mana cost X from your hand rather than pay Sickening Shoal's mana cost.
        FilterOwnedCard filter = new FilterOwnedCard("a black card with converted mana cost X from your hand");
        filter.add(new ColorPredicate(ObjectColor.BLACK));
        filter.add(Predicates.not(new CardIdPredicate(this.getId()))); // the exile cost can never be paid with the card itself
        this.addAbility(new AlternativeCostSourceAbility(new ExileFromHandCost(new TargetCardInHand(filter), true)));

        // Target creature gets -X/-X until end of turn.
        DynamicValue x = new SignInversionDynamicValue(new ExileFromHandCostCardConvertedMana());
        this.getSpellAbility().addEffect(new BoostTargetEffect(x, x, Duration.EndOfTurn, true));
        this.getSpellAbility().addTarget(new TargetCreaturePermanent());
    }

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

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