Sliv-Mizzet, Hivemind is a rare Legendary Creature — Dragon Sliver card from Mystery Booster Playtest Cards 2019 (CMB1), collector number 99. Current market price: $19.52, TCGplayer market prices via Scryfall.
Slivers you control have flying and "Whenever you draw a card, this creature deals 1 damage to any target" and "{T}: Draw a card."