foul-magics/Mage.Sets/src/mage/cards/l/LiquidFire.java

package mage.cards.l;

import mage.abilities.Ability;
import mage.abilities.costs.Cost;
import mage.abilities.costs.VariableCostImpl;
import mage.abilities.costs.VariableCostType;
import mage.abilities.dynamicvalue.DynamicValue;
import mage.abilities.dynamicvalue.common.GetXValue;
import mage.abilities.effects.OneShotEffect;
import mage.cards.CardImpl;
import mage.cards.CardSetInfo;
import mage.constants.CardType;
import mage.constants.Outcome;
import mage.game.Game;
import mage.game.permanent.Permanent;
import mage.players.Player;
import mage.target.common.TargetCreaturePermanent;

import java.util.UUID;

/**
 * @author Dilnu
 */
public final class LiquidFire extends CardImpl {

    public LiquidFire(UUID ownerId, CardSetInfo setInfo) {
        super(ownerId, setInfo, new CardType[]{CardType.SORCERY}, "{4}{R}{R}");

        // As an additional cost to cast Liquid Fire, choose a number between 0 and 5.
        this.getSpellAbility().addCost(new LiquidFireAdditionalCost());
        // Liquid Fire deals X damage to target creature and 5 minus X damage to that creature's controller, where X is the chosen number.
        DynamicValue choiceValue = GetXValue.instance;
        this.getSpellAbility().addTarget(new TargetCreaturePermanent());
        this.getSpellAbility().addEffect(new LiquidFireEffect(choiceValue));

    }

    private LiquidFire(final LiquidFire card) {
        super(card);
    }

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

    private static class LiquidFireEffect extends OneShotEffect {
        protected DynamicValue choiceValue;

        LiquidFireEffect(DynamicValue choiceValue) {
            super(Outcome.Damage);
            this.staticText = "{this} deals X damage to target creature and 5 minus X damage to that creature's controller, where X is the chosen number.";
            this.choiceValue = choiceValue;
        }

        private LiquidFireEffect(final LiquidFireEffect effect) {
            super(effect);
            this.choiceValue = effect.choiceValue;
        }

        @Override
        public boolean apply(Game game, Ability source) {
            Permanent target = game.getPermanent(targetPointer.getFirst(game, source));
            int creatureDamage = choiceValue.calculate(game, source, this);
            int playerDamage = 5 - creatureDamage;
            if (target != null) {
                target.damage(creatureDamage, source.getSourceId(), source, game);
                Player controller = game.getPlayer(target.getControllerId());
                if (controller != null) {
                    controller.damage(playerDamage, source.getSourceId(), source, game);
                }
                return true;
            }
            return false;
        }

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

class LiquidFireAdditionalCost extends VariableCostImpl {

    LiquidFireAdditionalCost() {
        super(VariableCostType.ADDITIONAL, "Choose a Number");
        this.text = "as an additional cost to cast this spell, choose a number between 0 and 5";
    }

    private LiquidFireAdditionalCost(final LiquidFireAdditionalCost cost) {
        super(cost);
    }

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

    @Override
    public Cost getFixedCostsFromAnnouncedValue(int xValue) {
        return null;
    }

    @Override
    public int getMaxValue(Ability source, Game game) {
        return 5;
    }
}