Legendary Artifact — Book
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“Creature cards” includes each card with the type creature, even if it has additional types, such as artifact.
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, Discard a card: Put a study counter on Grimoire of the Dead., Remove three study counters from Grimoire of the Dead and sacrifice it: Put all creature cards from all graveyards onto the battlefield under your control. They're black Zombies in addition to their other colors and types.