Varragoth, Bloodsky Sire is a rare Legendary Creature — Demon Rogue card from Kaldheim Promos (PKHM), collector number 115p. Current market price: $5.41 (foil $8.15), TCGplayer market prices via Scryfall.
Deathtouch Boast — {1}{B}: Target player searches their library for a card, then shuffles and puts that card on top. (Activate only if this creature attacked this turn and only once each turn.)