
{5}, {T}: Target player mills X cards, where X is the number of cards in that player's graveyard.
Keening Stone has 5 printings, first in Rise of the Eldrazi (2010). EDHREC ranks it #9,680 among Commander cards. It appears most in Bruvac the Grandiloquent decks (1,292 on EDHREC). 1 public deck on TCG runs it. It has 1 official ruling.
Deck counts from EDHREC.
Cards that show up in the same decks on EDHREC.