If I look at the Facebook page I only see information about some randomly put together Decks of 60 cards, but it doesnt state from which sets
Rarity: Cards are categorised by their rarity, which is denoted by a symbol at the bottom right corner
Once your engine is rolling, you can even stack only rats on the bottom of your deck, letting Grenzo cheat them in one after another as a steady win condition
Use Mega Gengar exs Shadowy Concealment ability to reduce the prize your opponent takes for knocking out Gengar by one, and then recycle Gengar to use his Mind Jack attack over and over if needed
If multiple replacement effects could be applied to the zone change, applying one to one of the two cards affects both cards
While a legit error, it could be replicated so its best to keep it sealed