def TabernacleUpkeep = new MagicAtUpkeepTrigger() {
    @Override
    public MagicEvent executeTrigger(final MagicGame game,final MagicPermanent permanent,final MagicPlayer upkeepPlayer) {
        return permanent.isController(upkeepPlayer) ?
            new MagicEvent(
                permanent,
                new MagicMayChoice(
                    new MagicPayManaCostChoice(MagicManaCost.create("{1}"))
                ),
                this,
                "You may\$ pay {1}. If you don't, destroy SN."
            ) :
            MagicEvent.NONE;
    }
    @Override
    public void executeEvent(final MagicGame game, final MagicEvent event) {
        if (event.isNo()) {
            game.doAction(new MagicDestroyAction(event.getPermanent()));
        }
    }
};

[
    new MagicStatic(
        MagicLayer.Ability,
        MagicTargetFilter.TARGET_CREATURE
    ) {
        @Override
        public void modAbilityFlags(final MagicPermanent source,final MagicPermanent permanent,final Set<MagicAbility> flags) {
            permanent.addAbility(TabernacleUpkeep);
        }
    }
]