As it spins, dead voices shriek in an ever-increasing cacophony, rending the mind asunder.

The Brothers' War Retro Artifacts

Keening Stone

{5}, {T}: Target player mills X cards, where X is the number of cards in that player's graveyard.

"The new prototype utilizing a rotational axis is marvelously effective: it makes me want to tear my own ears off."
—Ashnod, to her assistants

Commander 2016

{5}, {T}: Target player puts the top X cards of his or her library into his or her graveyard, where X is the number of cards in that player's graveyard.