[
    new MagicAtUpkeepTrigger() {
        @Override
        public MagicEvent executeTrigger(final MagicGame game,final MagicPermanent permanent,final MagicPlayer upkeepPlayer) {
            return permanent.isController(upkeepPlayer) ?
                new MagicEvent(
                    permanent,
                    new MagicSimpleMayChoice(
                        MagicSimpleMayChoice.PLAY_TOKEN,
                        1,
                        MagicSimpleMayChoice.DEFAULT_YES
                    ),
                    this,
                    "PN may\$ put a 0/1 colorless Eldrazi Spawn " +
                    "creature token onto the battlefield. It has " +
                    "\"Sacrifice this creature: Add {1} to your mana pool.\""
                ):
                MagicEvent.NONE;
        }
        @Override
        public void executeEvent(final MagicGame game, final MagicEvent event) {
            if (event.isYes()) {
                game.doAction(new MagicPlayTokenAction(event.getPlayer(),TokenCardDefinitions.get("Eldrazi Spawn")));
            }
        }        
    }
]