The creature that was targeted by The Black Gate's last ability can't be blocked by any creature the chosen player controls, including creatures that weren't on the battlefield when The Black Gate's ability resolved
For instance: Creatures (30) 4 Knight of the White Orchid 4 Dragon Hunter 3 Kytheon, Hero of Akros 3 Archangel of Tithes 4 Consul's Lieutenant 4 Thraben Inspector 4 Thalia's Lieutenant 4 Tireless Tracker Lands (22) Spells (8) Why dont you put Ulvenwald Mysteries in that Erdwal Illuminator/Ongoing Investigation deck you were describing above
Cards range from Near Mint (NM) to Moderately Played (MP)
Attack Phase : Choose an attack, calculate damage, and check for knockouts
Crushing Hammer is a good example of an energy denial card, offering the chance to discard an energy from any of your opponents Pokemon
"Pokmon Chronicles The Complete Collection (4Kids Entertainment English dub)", Internet Archive