If you have two on the battlefield, they'll each grant the other one shroud
They wont all show up here, but the companion cards, unlimited hand size cards, and relentless cards are categories of anomalies all their own
Activate only during your upkeep and only once each turn
Looking ahead on the Pokmon TCG release schedule: Storm Emeralda (starring Mega Rayquaza ex) and three MEGA Starter Set ex Decks (Eevee ex, Zoroark ex, and Meowscarada ex) arrive July 31st, followed by the global launch of 30th Celebration on September 16th, nine 30th Celebration Card Sets on October 16th, a Special Deck Set featuring Mega Feraligatr ex, Mega Dragonite ex, and Mega Gengar ex on November 13th, and Aura Seeker (starring Mega Lucario Z ex) on November 27th
As a result, those cards are super nice