Keeper of Secrets is a rare Creature — Demon card from Warhammer 40,000 Commander (40K), collector number 78★. Current market price: — (foil $17.12), TCGplayer market prices via Scryfall.
First strike, haste Symphony of Pain — Whenever you cast a spell from anywhere other than your hand, this creature deals damage equal to that spell's mana value to target opponent.