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PSilent Specter
Silent Specter
Creature — SpecterPRMrare
Flying
Whenever this creature deals combat damage to a player, that player discards two cards.
Morph 
(You may cast this card face down as a 2/2 creature for . Turn it face up any time for its morph cost.)
4/4
Rulings4
2013-09-15Monstrous isn't an ability that a creature has. It's just something true about that creature. If the creature stops being a creature or loses its abilities, it will continue to be monstrous.
2013-09-15Once a creature becomes monstrous, it can't become monstrous again. If the creature is already monstrous when the monstrosity ability resolves, nothing happens.
2013-09-15Colossus of Akros doesn't lose defender when it's monstrous. It's just able to attack.
2013-09-15An ability that triggers when a creature becomes monstrous won't trigger if that creature isn't on the battlefield when its monstrosity ability resolves.