Great Wall was there to stop that card and only that card er, rather, take away its crappy ability
Preventing cards you dont need from ending up in your possession stops your collection being ridden with cards youre never going to use
Other times, you'll need to be more careful
For example, blue decks in Pauper use Thought Scour and Mental Note to power out Tolarian Terror and Cryptic Serpent, while Vintage Dredge decks use cards like Prized Amalgam and Vengevine to flood the board with creatures from the graveyard
The payoff is okayish, with the third chapter trigger being particularly spicy if you've got Firecat Blitz, but the cost of discarding your hand and the risk of the saga being destroyed before you get to the second chapter is too risky for me
So we decided to cut the cards, that cards about lands being in or going to graveyard for now and focus more on triggering Tatyova and friends