He sought to peer beneath the surface of the moon. Instead, he peeled back the skin of reality itself.

Sudden Insight

Draw a card for each different mana value among nonland cards in your graveyard.

Foundations Jumpstart

A lucky draw from the Deck of Many Things gave Voltusk an inexplicable flash of understanding that he spent the rest of his life trying to repeat.

Adventures in the Forgotten Realms

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 {X} and a sorcery card with mana cost {2}{U}, you'll draw two cards.

If a card in your graveyard has {X} in its mana cost, X is 0 when determining that card's mana value.