Instead of discarding your opponent's entire deck, why not drown them in their own prize cards?
Mew can use attacks from Pokemon in the lost zone, so why don't we take advantage of that with Palkia & Dialga LEGEND? ...Well, half of it. On its own, it is worth only one Pirze Card when knocked out, but when combined with Shedinja or Life Dew, it makes it comletely free. Add that to the fact that it adds two prize cards to your opponent's count, they will be unable to stop your prize card mill! Ursaluna is here to recycle used cards like any dead Mews, Shedinjas, or the likes, along with Rescue Carrier. If you REALLY want to troll them, play Iono when they have so many prize cards that they draw their entire remaining deck, forcing them to lose on the spot. Happy Trolling!
NOTE: This is based off of my other deck Lost Box's Weird Uncle, but I focused it more. Please leave any comments/suggestions you may hve!