A Foolish Burial becomes an Upstart Goblin without granting the opponent Life Points, while a discarding effect essentially becomes free
Its nice that Grafdiggers Cage can come in against Collected Company decks, and I suspect that keeps the card in the forefront of players minds, but those are on the decline right now, and having a robust plan against Dredge is very important, which means playing cards that stop them from setting up in the first place
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Similarly Quarrels End is a lot better than it looks and its appreciably underrated
Couple this supportive might with the fact that Bibarel is stage one Pokmon, making it easy to evolve into, and you quickly realise why it has slotted seamlessly into decks such as Charizard ex and Arceus V Star