PrimalSurge.java example

Explorer
mage-master
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package mage.cards.p;

import mage.abilities.Ability;
import mage.abilities.effects.OneShotEffect;
import mage.cards.Card;
import mage.cards.CardImpl;
import mage.cards.CardSetInfo;
import mage.constants.CardType;
import mage.constants.Outcome;
import mage.constants.Zone;
import mage.game.Game;
import mage.game.permanent.Permanent;
import mage.players.Player;

import java.util.UUID;

/**
 *
 * @author North
 */
public class PrimalSurge extends CardImpl {

    public PrimalSurge(UUID ownerId, CardSetInfo setInfo) {
        super(ownerId,setInfo,new CardType[]{CardType.SORCERY},"{8}{G}{G}");


        // Exile the top card of your library. If it's a permanent card, you may put it onto the battlefield. If you do, repeat this process.
        this.getSpellAbility().addEffect(new PrimalSurgeEffect());
    }

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

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

class PrimalSurgeEffect extends OneShotEffect {

    public PrimalSurgeEffect() {
        super(Outcome.PutCardInPlay);
        this.staticText = "Exile the top card of your library. If it's a permanent card, you may put it onto the battlefield. If you do, repeat this process";
    }

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

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

    @Override
    public boolean apply(Game game, Ability source) {
        Player player = game.getPlayer(source.getControllerId());
        if (player == null) {
            return false;
        }

        boolean repeat;
        do {
            repeat = false;
            if (player.getLibrary().hasCards()) {
                Card card = player.getLibrary().removeFromTop(game);
                if (card != null) {
                    card.moveToExile(null, "", source.getSourceId(), game);
                    if (card.isPermanent()
                            && player.chooseUse(Outcome.PutCardInPlay, "Put " + card.getName() + " onto the battlefield?", source, game)) {
                        card.moveToZone(Zone.BATTLEFIELD, source.getSourceId(), game, false);

                        Permanent permanent = game.getPermanent(card.getId());
                        if (permanent == null) {
                            permanent = (Permanent) game.getLastKnownInformation(card.getId(), Zone.BATTLEFIELD);
                        }
                        if (permanent != null) {
                            repeat = true;
                        }
                    }
                }
            }
        } while (player.canRespond() && repeat);

        return true;
    }
}