While for some decks, the graveyard represents cards that have been used or destroyed, for graveyard-focused decks, this zone is capable of functioning as something comparable to a player's second hand
In Commander, it's absurd: you get four free spells, basically guaranteeing that you'll hit something good
She can ping creatures to turn them into Vampires and then seize control of them permanently , letting you pick apart an opponents board while building your own army of stolen assets

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This is also the deck that Id move Tectonic Hellion into, since it will likely want the help, which suggests even more unblockableness, like Sun Quan, Lord of Wu