Sidisi, Undead Vizier is a rare Legendary Creature — Zombie Snake card from Dragons of Tarkir Promos (PDTK), collector number 120p. Current market price: $16.97 (foil $23.22), TCGplayer market prices via Scryfall.
Deathtouch Exploit (When this creature enters, you may sacrifice a creature.) When Sidisi exploits a creature, you may search your library for a card, put it into your hand, then shuffle.