While losing Settle the Wreckage does hurt against creature decks, the addition of Shield Mare and Baffling End does give us some more good sideboard options to help against aggressive decks, so hopefully the damage will be mitigated
The card's Read A Book ability allows an extra card to be added to the inkwell each turn, while My Favorite Part
The average mana curve for Sealed should look something like this: 1 Mana: 12 cards 2 Mana: 78 cards 3 Mana: 56 cards 4 Mana: 34 cards 5 Mana: 23 cards 6 Mana: 01 card and 17 lands
Also, shes an Elf Shaman, rather than a Human Cleric, which should also provide some additional synergy in tribal decks
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Even in Limited, it is incredibly dangerous to do given common effects that return cards from graveyards to their owner's hand