Sidisi, Brood Tyrant is a rare Legendary Creature — Snake Shaman card from Double Masters 2022 (2X2), collector number 276. Current market price: $1.17 (foil $1.80), TCGplayer market prices via Scryfall.
Whenever Sidisi enters or attacks, mill three cards. Whenever one or more creature cards are put into your graveyard from your library, create a 2/2 black Zombie creature token.