Sudden Insight
Instant
Draw a card for each different mana value among nonland cards in your graveyard.
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.
Illustrated by
Adventures in the Forgotten Realms#77UncommonEnglishLegality
Rulings
Jul 23, 2021
If a card in your graveyard has 
in its mana cost, X is 0 when determining that card's mana value.
Jul 23, 2021
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.