magarena/release/Magarena/scripts/Dreadwaters.groovy

[
    new MagicSpellCardEvent() {
        @Override
        public MagicEvent getEvent(final MagicCardOnStack cardOnStack, final MagicPayedCost payedCost) {
            return new MagicEvent(
                cardOnStack,
                MagicTargetChoice.TARGET_PLAYER,
                this,
                "Target player\$ puts the top X cards of his or her library into " +
                "his or her graveyard, where X is the number of lands you control."
            );
        }
        @Override
        public void executeEvent(final MagicGame game, final MagicEvent event) {
            event.processTargetPlayer(game,new MagicPlayerAction() {
                public void doAction(final MagicPlayer target) {
                    final MagicPlayer player = event.getPlayer();
                    final int amount = player.getNrOfPermanentsWithType(MagicType.Land);
                    game.doAction(new MagicMillLibraryAction(target,amount));
                }
            });
        }
    }
]