magarena/release/Magarena/scripts/Day_of_the_Dragons.groovy

[
    new MagicWhenComesIntoPlayTrigger() {
        @Override
        public MagicEvent executeTrigger(final MagicGame game,final MagicPermanent permanent, final MagicPayedCost payedCost) {
            return new MagicEvent(
                permanent,
                this,
                "Exile all creatures you control. Then put that many 5/5 " +
                "red Dragon creature tokens with flying onto the battlefield."
            );
        }
        @Override
        public void executeEvent(final MagicGame game, final MagicEvent event) {
            final Collection<MagicPermanent> targets =
                    game.filterPermanents(event.getPlayer(),MagicTargetFilter.TARGET_CREATURE_YOU_CONTROL);
            for (final MagicPermanent target : targets) {
                game.doAction(new MagicExileUntilThisLeavesPlayAction(
                    event.getPermanent(),
                    target
                ));
            }
            game.doAction(new MagicPlayTokensAction(
                event.getPlayer(),
                TokenCardDefinitions.get("Dragon5"),
                targets.size()
            ));
        }
    },
    new MagicWhenLeavesPlayTrigger() {
        @Override
        public MagicEvent executeTrigger(final MagicGame game,final MagicPermanent permanent, final MagicRemoveFromPlayAction act) {
            if (act.isPermanent(permanent) &&
                !permanent.getExiledCards().isEmpty()) {
                final MagicCardList clist = new MagicCardList(permanent.getExiledCards());
                return new MagicEvent(
                    permanent,
                    permanent.getController(),
                    this,
                    clist.size() == 1 ?
                        "Sacrifice all Dragons. Return " + clist.get(0) + " to the battlefield." :
                        "Sacrifice all Dragons. Return exiled cards to the battlefield."
                );
            }
            return MagicEvent.NONE;
        }
        @Override
        public void executeEvent(final MagicGame game, final MagicEvent event) {
            final Collection<MagicPermanent> targets =
                    game.filterPermanents(event.getPlayer(),MagicTargetFilter.TARGET_DRAGON_YOU_CONTROL);
            for (final MagicPermanent target : targets) {
                game.doAction(new MagicSacrificeAction(target));
            }
            final MagicPermanent permanent = event.getPermanent();
            game.doAction(new MagicReturnExiledUntilThisLeavesPlayAction(
                permanent,
                MagicLocationType.Play,
                event.getPlayer()
            ));
        }
    }
]