mage/Mage.Sets/src/mage/sets/exodus/EntropicSpecter.java

/*
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 *        conditions and the following disclaimer.
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 *        of conditions and the following disclaimer in the documentation and/or other materials
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package mage.sets.exodus;

import java.util.UUID;

import mage.constants.*;
import mage.MageInt;
import mage.abilities.Ability;
import mage.abilities.common.AsEntersBattlefieldAbility;
import mage.abilities.common.DealsDamageToAPlayerTriggeredAbility;
import mage.abilities.common.SimpleStaticAbility;
import mage.abilities.dynamicvalue.DynamicValue;
import mage.abilities.effects.OneShotEffect;
import mage.abilities.effects.common.discard.DiscardTargetEffect;
import mage.abilities.effects.common.continious.SetPowerToughnessSourceEffect;
import mage.abilities.keyword.FlyingAbility;
import mage.cards.CardImpl;
import mage.game.Game;
import mage.game.permanent.Permanent;
import mage.players.Player;
import mage.target.common.TargetOpponent;

/**
 *
 * @author jeffwadsworth
 */
public class EntropicSpecter extends CardImpl {

    public EntropicSpecter(UUID ownerId) {
        super(ownerId, 61, "Entropic Specter", Rarity.RARE, new CardType[]{CardType.CREATURE}, "{3}{B}{B}");
        this.expansionSetCode = "EXO";
        this.subtype.add("Specter");
        this.subtype.add("Spirit");

        this.color.setBlack(true);
        this.power = new MageInt(0);
        this.toughness = new MageInt(0);

        // Flying
        this.addAbility(FlyingAbility.getInstance());
        
        // As Entropic Specter enters the battlefield, choose an opponent.
        this.addAbility(new AsEntersBattlefieldAbility(new ChooseOpponent()));
        
        // Entropic Specter's power and toughness are each equal to the number of cards in the chosen player's hand.
        this.addAbility(new SimpleStaticAbility(Zone.ALL, new SetPowerToughnessSourceEffect(new CardsInTargetPlayerHandCount(), Duration.WhileOnBattlefield)));
        
        // Whenever Entropic Specter deals damage to a player, that player discards a card.
        this.addAbility(new DealsDamageToAPlayerTriggeredAbility(new DiscardTargetEffect(1, false), false, true));
    }

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

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

class ChooseOpponent extends OneShotEffect {

    public ChooseOpponent() {
        super(Outcome.Neutral);
        this.staticText = "choose an opponent";
    }

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

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

    @Override
    public boolean apply(Game game, Ability source) {
        Player player = game.getPlayer(source.getControllerId());
        Permanent permanent = game.getPermanent(source.getSourceId());
        if (player != null && permanent != null) {
            TargetOpponent target = new TargetOpponent();
            target.setNotTarget(true);
            if (player.choose(this.outcome, target, source.getSourceId(), game)) {
                Player chosenPlayer = game.getPlayer(target.getFirstTarget());
                if (chosenPlayer != null) {
                    game.informPlayers(permanent.getName() + ": " + player.getName() + " has chosen " + chosenPlayer.getName());
                    game.getState().setValue(permanent.getId() + "_player", target.getFirstTarget());
                    return true;
                }
            }
        }
        return false;
    }
}

class CardsInTargetPlayerHandCount implements DynamicValue {
    @Override
    public int calculate(Game game, Ability sourceAbility) {
        if (sourceAbility != null) {
            UUID playerId = (UUID) game.getState().getValue(sourceAbility.getSourceId() + "_player");
            Player chosenPlayer = game.getPlayer(playerId);
            if (chosenPlayer != null) {
                return chosenPlayer.getHand().size();
            }
        }
        return 0;
    }

    @Override
    public DynamicValue copy() {
        return new mage.abilities.dynamicvalue.common.CardsInControllerHandCount();
    }

    @Override
    public String getMessage() {
        return "cards in chosen opponents hand";
    }

    @Override
    public String toString() {
        return "1";
    }
}