At its core, activating this card only works when an opponent tries to activate a Monsters effect in their hand, from the GY, or while banished
That might not sound too great, but it essentially puts your opponent on a six-turn timer to get rid of Trevenant BREAK, otherwise all of their Pokemon will (probably) be dead after taking 180 damage
Inflict 800 damage to your opponent for each sent card, also for the rest of the turn, reduce all effect damage your opponent would take from non-Fiend monster effects to 0
As you complete duels and level up, you'll progress through the Duel Pass and unlock various rewards
Box Art and Design Notes The packaging art focuses on the main Mega Evolutions TCG: Venusaur , Lucario , Gardevoir , and Kangaskhan