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Coloque qualquer número de cards de artefato alvo de seu cemitério no topo de seu grimório.
Compre um card.
You can cast this with zero targets. If you do, you’ll get to draw a card. However, if you cast this with at least one target and all of those targets become illegal (because another effect has removed them from the graveyard, perhaps), the spell won’t resolve and you won’t get to draw a card.