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Cerebral Eruption
Sorcery
Target opponent reveals the top card of their library. Cerebral Eruption deals damage equal to the revealed card's mana value to that player and each creature that player controls. If a land card is revealed this way, return Cerebral Eruption to its owner's hand.
Rulings (6)
If the revealed card has no mana symbols in its upper right corner (because it’s a land card, for example), its mana value is 0.
Jan 1, 2011
If the mana cost of the revealed card includes X generic mana , X is considered to be 0.
Jan 1, 2011
Once the card is revealed, it’s too late for players to respond. The targeted opponent can’t, for example, see how much damage will be dealt, then cast a damage prevention spell or activate a regeneration ability. All such actions must be done before Cerebral Eruption starts to resolve.
Jan 1, 2011
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