The Hourglass Coven is a rare Legendary Creature — Hag Warlock card from Alchemy Horizons: Baldur's Gate (HBG), collector number 45.
When The Hourglass Coven enters the battlefield, draft a card from The Hourglass Coven's spellbook twice, then put those cards onto the battlefield. Other Warlocks you control get +1/+1.