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Rulings
Although land cards aren't considered, nonland cards with mana value 0 are. For example if the cards in your graveyard are an artifact card with mana cost and a sorcery card with mana cost , you'll draw two cards.
If a card in your graveyard has in its mana cost, X is 0 when determining that card's mana value.
If a card in your graveyard has in its mana cost, X is 0 when determining that card's mana value.
Rulings
Although land cards aren't considered, nonland cards with mana value 0 are. For example if the cards in your graveyard are an artifact card with mana cost and a sorcery card with mana cost , you'll draw two cards.
If a card in your graveyard has in its mana cost, X is 0 when determining that card's mana value.
If a card in your graveyard has in its mana cost, X is 0 when determining that card's mana value.
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