The Knights Who Say "Ni!"

When Protean Hulk dies, search your library for any number of creature cards with total mana value 6 or less, put them onto the battlefield, then shuffle.
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"Ni! Ni! Ni!"
"Who are you?"
"We are the Knights Who Say "Ni!"!"
"No! Not the Knights Who Say "Ni!"?"
—The Knights Who Say "Ni!" and King Arthur