You need something to do with all that mana, of course, and green has plenty of fatties to choose from
If its an Aura, she untaps herself and you scry 2
You may cast that spell from exile starting from your next turn. Its important that the choice of Lesson should be hidden from your opponent to help differentiate prepare from plot
It's basically cheating (or, more precisely: a color pie break) that lets red decks get rid of problematic cards like enchantments and guarantees that its target gets out of sight and out of mind, but runs the risk of replacing it with something even worse
VENERATED ROTPRIEST Venerated Rotpriest is perhaps the most powerful Toxic creature printed for its ability to threaten wins out of nowhere across multiple formats
This power creep is due to the fact that you have to build your deck around Sorin, making him only playable in Vampire-focused strategies