Appetite for Brains
Sorcery
Target opponent reveals their hand. You choose a card from it with converted mana cost 4 or greater and exile that card.
Just as with a peach, the first bite is always the juiciest.
Illustrated by
Avacyn Restored#84UncommonEnglishLegality
Rulings
Dec 7, 2018
If a card in a player’s hand has 
in its mana cost, X is considered to be 0.