[
    new MagicAtUpkeepTrigger() {
        @Override
        public MagicEvent executeTrigger(final MagicGame game, final MagicPermanent permanent, final MagicPlayer upkeepPlayer) {
            return permanent.isController(upkeepPlayer) ?
                new MagicEvent(
                    permanent,
                    permanent.getController(),
                    permanent.getOpponent(),
                    this,
                    "RN discards a card if PN controls the creature " +
                    "with the greatest power or tied for the greatest power."
                ) :
                MagicEvent.NONE;
        }
        @Override
        public void executeEvent(final MagicGame game, final MagicEvent event) {
            final MagicPlayer player = event.getPlayer();
            final Collection<MagicPermanent> targets = game.filterPermanents(
                player,
                MagicTargetFilter.TARGET_CREATURE
            );
            MagicPermanent highest = MagicPermanent.NONE;
            for (final MagicPermanent creature : targets) {
                if (creature.getPower() > highest.getPower()) {
                    highest = creature;
                }
            }
            if (highest.isController(player)) {
                game.addEvent(new MagicDiscardEvent(
                    event.getSource(),
                    event.getRefPlayer()
                ));
            }
        }
    }
]