Between Chalice of the Void, Blood Moon, and the various white sideboard hate cards, W/R Prison has the tools to be able to fight the various unfair decks that have jumped up in popularity, while still having a good matchup against other midrange decks
Because it wasnt available through stores or public giveaways, it has remained a tough card to find
For that price, you gain life equal to the number of creature cards in your graveyard
It is useless if your opponents ever run out of creatures, but that's kind of your goal with this blade
The three names that come up most consistently in the Pokmon card bot space are Stellar AIO, BotBro, and Nike Shoe Bot
Paired with healing or resist, she can do some work