In this role, Chthonian Nightmare has potential to be even better than its Exodus counterpart due to the cheaper mana cost, warranting its A tier status
The problem with 60 cards is when all those extra duplicates bunch up at once
Any deck that floods the board with creatures can cash in this green sorcery for a couple cards, but gaining 8 life while you do it adds a lot of value here
You can only choose one of them, but each is potentially pretty powerful and useful in different situations
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On the one hand, you're going to be playing a lot of instants and sorceries