Especially in older Eternal formats like Modern and Legacy where you can quickly fill up the graveyard with fetch lands and other spells like Thought Scour to draw three extra cards as early as turn 2
The simulator uses the exact same odds as physical packs
The big thing about Reanimator is that it does require a lot of format knowledge to understand when to sideboard juke, when to drop your Reanimation package, when to go light on that, and how to navigate pivoting between Tempo and Graveyard combo
Many players are also using Wish, letting them leave their wincon in their sideboard to be pulled out when the time is right, along with a load of other useful utility spells and answers
This is a huge vanilla creature -- so huge that I think it's actually going to make the cut in most Green decks, even if it doesn't do anything other than attack or block
Then the flashbacking sorcery for two normally and four with flashback is next