They do not have a massive impact on the Brawl format, where they are already legal, and so a change to the rules to allow any would likely not shake the game up too much
They stay attached to the Pokmon in question until it leaves play
You can also +1 to make your sorceries, like Casualties of War, be nasty instants that'll blow out the game
By using cards such as Grave Pact, Ashnods Altar, and Butcher of Malakir you should be able to keep most of your opponents from being able to maintain a board state
Lost Thunder is the eighth main expansion in the Sun & Moon series and is also loosely themed around the Pokemon Ultra Sun & Ultra Moon videogames
Test Your Lands And Other Cards In A Commander Deck Against A Variety Of Opponents Playtesting against various opponents gives a better sense of how the deck performs in different situations