FistOfSuns.java example

Explorer
mage-master
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package mage.cards.f;

import mage.abilities.Ability;
import mage.abilities.common.SimpleStaticAbility;
import mage.abilities.condition.common.SourceIsSpellCondition;
import mage.abilities.costs.AlternativeCostSourceAbility;
import mage.abilities.costs.mana.ManaCostsImpl;
import mage.abilities.effects.ContinuousEffectImpl;
import mage.cards.CardImpl;
import mage.cards.CardSetInfo;
import mage.constants.*;
import mage.game.Game;
import mage.players.Player;

import java.util.UUID;

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

    public FistOfSuns(UUID ownerId, CardSetInfo setInfo) {
        super(ownerId,setInfo,new CardType[]{CardType.ARTIFACT},"{3}");

        // You may pay {W}{U}{B}{R}{G} rather than pay the mana cost for spells that you cast.
        this.addAbility(new SimpleStaticAbility(Zone.BATTLEFIELD, new FistOfSunsRuleEffect()));
    }

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

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

class FistOfSunsRuleEffect extends ContinuousEffectImpl {

    static AlternativeCostSourceAbility alternativeCastingCostAbility = new AlternativeCostSourceAbility(new ManaCostsImpl("{W}{U}{B}{R}{G}"), SourceIsSpellCondition.instance);
    
    public FistOfSunsRuleEffect() {
        super(Duration.WhileOnBattlefield, Outcome.Detriment);
        staticText = "You may pay {W}{U}{B}{R}{G} rather than pay the mana cost for spells that you cast";
    }

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

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

    @Override
    public boolean apply(Layer layer, SubLayer sublayer, Ability source, Game game) {
        Player controller = game.getPlayer(source.getControllerId());
        if (controller != null) {
            controller.getAlternativeSourceCosts().add(alternativeCastingCostAbility);
            return true;
        }
        return false;
    }

    @Override
    public boolean apply(Game game, Ability source) {
        return false;
    }

    @Override
    public boolean hasLayer(Layer layer) {
        return layer == Layer.RulesEffects;
    }
}