When Protean Hulk dies, search your library for any number of creature cards with total converted mana cost 6 or less and put them onto the battlefield. Then shuffle your library.
3/16/2018 If a card in your library has in its mana cost, X is considered to be 0.
3/16/2018 You can find any number of creature cards, so long as their total converted mana cost is 6 or less. For example, you could find eight creature cards with converted mana cost 0 and three with converted mana cost 2, but you couldn’t find two with converted mana cost 4.